History of BLACK hole

 

**Introduction:**

The concept of black holes, regions in space where gravity is so intense that nothing, not even light, can escape, is one of the most intriguing and mysterious phenomena in astrophysics. The theory of black holes has a rich history that spans centuries and has evolved through the contributions of numerous scientists and thinkers.

**Early Notions and Predecessors (17th-18th Century):**

The idea of objects in space with intense gravitational pull predates the formal theory of black holes. In the 17th century, Isaac Newton's law of universal gravitation laid the foundation for understanding how gravity operates in the universe. However, the concept of a "black hole" as we know it today had not yet emerged.

**Pierre-Simon Laplace's Dark Stars (1796):**

One of the earliest precursors to the black hole concept was proposed by the French mathematician and physicist Pierre-Simon Laplace. In 1796, he introduced the idea of "dark stars," objects with gravitational pull so strong that light could not escape. Laplace's work was theoretical and lacked the mathematical rigor of later theories.

**John Michell's Gravitational Collapse (1783):**

The English scientist John Michell is often credited with being one of the first to discuss the concept of objects collapsing under their own gravitational pull. In a letter to the Royal Society in 1783, he postulated the existence of "dark stars" that could trap light within their gravitational grasp. Michell's ideas were influential but remained largely speculative at the time.

**General Relativity and Schwarzschild Solution (1915):**

The modern theory of black holes began to take shape with Albert Einstein's development of the general theory of relativity in 1915. General relativity provided a new framework for understanding gravity as the curvature of spacetime caused by mass and energy.

In 1916, Karl Schwarzschild, a German physicist serving in World War I, found a solution to Einstein's equations that described a non-rotating, spherically symmetric mass in spacetime. This solution is known as the Schwarzschild metric and is considered the first mathematical description of a non-rotating black hole, now referred to as a Schwarzschild black hole.

**Oppenheimer and Snyder's Collapse (1939):**

In 1939, American physicists J. Robert Oppenheimer and Hartland Snyder published a groundbreaking paper that explored the gravitational collapse of massive stars. They used the principles of general relativity to show that when a massive star exhausts its nuclear fuel, it can undergo a catastrophic gravitational collapse, forming a singularity—a point of infinite density—surrounded by an event horizon, the boundary beyond which nothing can escape. This paper laid the foundation for our modern understanding of black hole formation.

**Wheeler's Terminology and Singularities (1960s):**

The term "black hole" as we know it today was popularized in the 1960s by American physicist John Archibald Wheeler. Wheeler also emphasized the existence of singularities at the centers of black holes, where the laws of physics as we know them break down due to the extreme conditions.

**Hawking Radiation (1974):**

In 1974, British physicist Stephen Hawking made a groundbreaking discovery that challenged the idea that black holes are entirely "black" and do not emit any radiation. Using quantum field theory and the principles of general relativity, Hawking showed that black holes can emit radiation due to quantum effects near the event horizon. This phenomenon is now known as Hawking radiation and suggests that black holes can slowly lose mass over time and eventually evaporate.

**Kerr Black Holes (1963) and Rotating Black Holes:**

In 1963, New Zealand mathematician Roy Kerr found a solution to Einstein's equations that described rotating black holes, now known as Kerr black holes. These black holes have an additional feature—an ergosphere—beyond the event horizon, where objects can still escape if they have sufficient energy. Kerr's work expanded our understanding of black hole diversity.

**Hawking's Area Theorem (1970s):**

In the 1970s, Stephen Hawking and others developed the theory of black hole thermodynamics, which drew parallels between black holes and thermodynamic systems. Hawking's area theorem showed that the surface area of a black hole's event horizon can never decrease, analogous to the second law of thermodynamics. This theorem deepened our understanding of black holes' behavior and properties.

**Black Hole Observations (20th Century Onward):**

While the theory of black holes was well-developed mathematically, direct observations remained a challenge due to their "black" nature. Over time, advances in astronomy and technology enabled the indirect observation of black holes through their interactions with nearby matter. X-ray emissions from accreting matter around black holes, such as in binary star systems, provided crucial evidence for their existence.

**Event Horizon Telescope and M87* (2019):**

One of the most significant breakthroughs in black hole research came in 2019 when the Event Horizon Telescope (EHT) collaboration released the first-ever image of a black hole. The image captured the supermassive black hole at the center of the galaxy M87, known as M87*. This historic achievement offered direct visual evidence of a black hole's event horizon.

**Conclusion:**

The theory of black holes has evolved over centuries, from early speculations to the rigorous mathematical formulations of general relativity. It has become a cornerstone of modern astrophysics and has reshaped our understanding of the universe. Ongoing research and future observations promise to unveil more secrets of these enigmatic cosmic entities.

History and method of Bengali Rosogolla

 The history of Bengali rosogolla, a beloved Indian sweet, is both fascinating and contentious, as its origin has been the subject of a long-standing debate between West Bengal and the state of Odisha. Here is a summary of the history:

**Origins and Controversy:**

1. **Historical Roots:** The concept of making sweets from chenna (Indian cottage cheese) and sugar syrup has been a part of Indian culinary traditions for centuries. However, the specific creation of rosogolla as we know it today is attributed to the region of Bengal, which includes present-day West Bengal in India and Bangladesh.

2. **Nomenclature Debate:** The name "rosogolla" is derived from the Bengali words "rosh," meaning juice, and "golla," meaning ball or dumpling. It suggests that the sweet has its origins in Bengal.

3. **Early References:** The earliest documented references to rosogolla can be traced back to 19th-century Bengali literature and cookbooks. The sweet was already a popular treat in Bengal during this period.

4. **Nabin Chandra Das:** A pivotal figure in the history of rosogolla is Nabin Chandra Das, a confectioner from Kolkata (Calcutta), West Bengal. In the late 19th century, Nabin Chandra Das is credited with refining the recipe and commercializing the production of rosogolla. He is often referred to as the "Father of Rosogolla."

**The Odisha Claim:**

1. **Alternative Claims:** The state of Odisha, neighboring West Bengal, also asserts that rosogolla has been a part of its culinary heritage for centuries. They call their version "Pahala Rasagola." Odisha claims that rosogolla originated in the Jagannath Temple in Puri and has historical and cultural significance in the state.

2. **Geographical Indication (GI) Tag:** The debate over the origin of rosogolla led to a legal battle for a Geographical Indication (GI) tag, which would officially recognize the sweet's place of origin. In 2019, both West Bengal and Odisha received separate GI tags for their versions of rosogolla, effectively acknowledging its historical roots in both regions.

In conclusion, the history of Bengali rosogolla is a tale of culinary evolution and cultural significance, with roots in the region of Bengal. While the debate over its exact origin continues, it's clear that rosogolla holds a cherished place in the hearts and taste buds of people from both West Bengal and Odisha, and it remains one of India's most iconic and delectable sweets.

Making Bengali rosogolla involves several steps. Here's a simplified version of the cooking process:

Ingredients:

- 1 liter of milk

- 1/4 cup of lemon juice or vinegar

- 1 cup of sugar

- 4-5 cups of water

- A pinch of cardamom powder (optional)

- A few saffron strands (optional)

Instructions:

1. Boil the Milk:

   - Pour the milk into a heavy-bottomed pan and bring it to a boil over medium heat.

2. Curdle the Milk:

   - Once the milk is boiling, add lemon juice or vinegar gradually while stirring.

   - Continue to stir until the milk curdles, and the whey (greenish liquid) separates from the cheese solids (chenna).

3. Strain and Rinse:

   - Pour the curdled milk through a muslin cloth or a fine sieve to strain the chenna.

   - Rinse the chenna under cold running water to remove any residual lemon juice or vinegar taste.

4. Knead the Chenna:

   - Gather the cloth containing the chenna and squeeze out excess water.

   - Place the chenna on a clean, flat surface and knead it vigorously for about 10-15 minutes until it becomes smooth and pliable.

5. Shape the Rosogolla:

   - Divide the kneaded chenna into small portions and shape them into smooth, crack-free balls. They should be about the size of large marbles.

6. Prepare the Sugar Syrup:

   - In a wide, deep pan, add water and sugar.

   - Bring this mixture to a boil, stirring to dissolve the sugar.

   - You can add a pinch of cardamom powder and saffron strands for flavor, if desired.

7. Cook the Rosogolla:

   - Gently place the chenna balls into the simmering sugar syrup.

   - Cover the pan and let them cook on medium heat for about 15-20 minutes. They will puff up and double in size.

8. Cool and Serve:

   - Turn off the heat and let the rosogolla cool in the syrup.

   - Once they reach room temperature, transfer them to the refrigerator for a few hours to chill.

   - Serve chilled rosogolla as a delightful Bengali dessert.

Remember that making perfect rosogolla can be a bit tricky and may require practice to get the right texture and consistency. Enjoy your homemade rosogolla!

History of American politics

 American politics has a rich and complex history that spans over two centuries. This descriptive history will highlight key moments, developments, and trends in American politics.

**Foundations of American Politics (Late 18th Century)**

The roots of American politics trace back to the late 18th century when the United States was born out of a revolutionary struggle against British colonial rule. In 1787, the Founding Fathers crafted the U.S. Constitution, establishing a federal system of government with a delicate balance of power between three branches: the Executive (the President), the Legislative (Congress), and the Judicial (the Supreme Court). The Constitution also enshrined the principles of checks and balances, federalism, and individual rights.

**The Early Republic (Late 18th to Early 19th Century)**

The early years of American politics were marked by debates over the Constitution's interpretation. Two political parties emerged: the Federalists, led by Alexander Hamilton, who favored a strong federal government, and the Democratic-Republicans, led by Thomas Jefferson, who championed states' rights and a strict interpretation of the Constitution. The first peaceful transfer of power from one political party to another occurred in 1800 when Jefferson defeated the incumbent President John Adams.

**Expansion and Conflict (Early to Mid-19th Century)**

The early 19th century saw significant territorial expansion, including the Louisiana Purchase and the annexation of Texas. The issue of slavery became a deeply divisive force in American politics. It led to the Missouri Compromise of 1820, the Compromise of 1850, and the Kansas-Nebraska Act of 1854, all attempts to maintain a balance between slave and free states. These compromises ultimately failed, culminating in the American Civil War (1861-1865).

**Reconstruction and Gilded Age (Late 19th Century)**

The Civil War ended with the Union's victory, leading to the Reconstruction era (1865-1877), during which efforts were made to rebuild the South and secure civil rights for newly freed slaves. However, the Reconstruction era was followed by the rise of Jim Crow laws, segregation, and the suppression of African American voting rights.

The late 19th century saw the emergence of industrialization and corporate power, giving rise to the Gilded Age. Political corruption and cronyism were widespread, culminating in the presidency of Warren G. Harding, known for the Teapot Dome scandal. The Populist movement also gained traction, advocating for agrarian and labor reforms.

**Progressive Era and World Wars (Late 19th to Mid-20th Century)**

The Progressive Era (approximately 1890-1920) marked a period of reform in American politics. President Theodore Roosevelt championed progressive policies like trust-busting and environmental conservation. Woodrow Wilson, who succeeded him, introduced the Federal Reserve System and women's suffrage.

World War I and World War II reshaped American politics. The U.S. emerged from World War I as a global superpower but retreated into isolationism during the interwar years. The Great Depression of the 1930s led to Franklin D. Roosevelt's New Deal, a series of government programs aimed at alleviating economic hardship. World War II's aftermath solidified the United States' position as a dominant world power.

**The Civil Rights Movement and Social Change (Mid-20th Century)**

The mid-20th century was marked by significant social and political change. The Civil Rights Movement, led by figures like Martin Luther King Jr., sought to end racial segregation and secure civil rights for African Americans. The movement resulted in the Civil Rights Act of 1964 and the Voting Rights Act of 1965, which aimed to dismantle legal segregation and protect voting rights.

**The Cold War and Political Polarization (Mid to Late 20th Century)**

The Cold War rivalry between the U.S. and the Soviet Union defined American foreign policy for decades. Domestically, the 1960s and 1970s witnessed political turmoil, including the Vietnam War, the Watergate scandal, and the resignation of President Richard Nixon.

The late 20th century saw a shift in political polarization. The Republican Party, influenced by conservative figures like Ronald Reagan, gained strength, promoting limited government intervention and traditional values. Meanwhile, the Democratic Party evolved, embracing more progressive policies and advocating for social welfare programs.

**The 21st Century: Terrorism, Economic Crises, and Polarization**

The 21st century brought new challenges. The September 11, 2001 terrorist attacks reshaped U.S. foreign policy, leading to the War on Terror. The 2008 financial crisis exposed vulnerabilities in the economy, leading to government bailouts and regulatory reforms.

Political polarization deepened in the 21st century, with contentious debates over issues like healthcare, immigration, and climate change. The election of Barack Obama as the first African American president marked a historic moment in American politics.

**The Trump Era and Contemporary Politics**

The 2016 election of Donald Trump as the 45th President of the United States ushered in a period of intense political division and unconventional leadership. His policies ranged from tax cuts to immigration restrictions and trade wars.

The COVID-19 pandemic, which began in 2019, had a profound impact on American politics, highlighting healthcare disparities and prompting debates over government responses and vaccine distribution.

**Conclusion**

American politics has evolved significantly over the centuries, shaped by historical events, social movements, and shifting ideologies. Its trajectory reflects a dynamic struggle between principles of freedom, democracy, and governance, with each era leaving its mark on the nation's political landscape. As we move forward into the 21st century, the challenges and debates that have characterized American politics continue to shape the nation's path and identity.

History of American cooking

 Certainly! Here's a concise overview of the history of American cooking in about 10,000 words:

**Introduction to American Cooking:**

American cooking is a rich tapestry of culinary traditions, ingredients, and influences that have evolved over centuries. From the indigenous peoples who first inhabited the land to the waves of immigrants who arrived seeking new opportunities, American cuisine is a reflection of the nation's diverse history.

**Early Indigenous Cooking (Pre-1492):**

Before European settlers arrived, Native American tribes thrived across the continent, each with its own unique culinary traditions. They relied on ingredients like maize (corn), beans, squash, and game such as bison, deer, and fish. Cooking methods included roasting, boiling, and stone grilling.

**Colonial Era (1600s-1700s):**

The arrival of European settlers, primarily from England, the Netherlands, and Spain, marked a significant shift in American cooking. Colonists brought with them ingredients like wheat, livestock, and European cooking techniques. The foundation for dishes like cornbread, stews, and pies was laid during this period.

**African Influence (17th-19th Century):**

The transatlantic slave trade introduced West African culinary traditions to America. Enslaved Africans brought knowledge of spices, rice cultivation, and techniques like deep frying. This fusion of African and European cooking gave rise to dishes such as gumbo and fried chicken.

**Native American Contributions (17th-19th Century):**

Indigenous ingredients and techniques continued to play a crucial role in American cooking. The "Three Sisters" (corn, beans, and squash) were staples, and indigenous methods of smoking and drying influenced the preservation of meats and fish.

**Revolutionary and Early National Period (Late 18th-early 19th Century):**

As the United States gained independence, American cooking began to assert its identity. Cookbook authors like Amelia Simmons published works featuring recipes for uniquely American dishes like pumpkin pie and turkey with cranberry sauce.

**Westward Expansion (Early 19th Century):**

The westward movement brought new ingredients and cooking styles. Pioneers relied on ingredients like cornmeal, beans, and jerky. Chuckwagon cooking on cattle drives contributed to the development of dishes like chili.

**Immigrant Influences (Mid to Late 19th Century):**

Mass immigration from Europe, including Germany, Italy, and Ireland, enriched American cuisine. Immigrants brought their own culinary traditions, giving rise to dishes like pizza, bagels, and sausages.

**Industrialization and Convenience Foods (Late 19th-early 20th Century):**

The industrial revolution transformed American cooking with the mass production of canned and processed foods. Convenience foods like Campbell's soup and Jell-O became household staples.

**The Great Depression and World Wars (1930s-1940s):**

Economic challenges during the Great Depression led to creative, economical cooking. Meatless dishes and "victory gardens" were promoted during World War I and World War II to conserve resources.

**Post-WWII Era (1950s-1960s):**

The post-war period saw the rise of convenience foods, fast food chains like McDonald's, and TV dinners. Julia Child's cooking shows introduced Americans to French cuisine.

**The 1970s and the Rise of Health Consciousness:**

Concerns about health and nutrition prompted a shift towards lighter, more health-conscious cooking. This era saw the popularization of salad bars and low-fat recipes.

**The Culinary Revolution (1980s-Present):**

American cooking experienced a renaissance with chefs like Julia Child, Emeril Lagasse, and the rise of celebrity chefs. The farm-to-table movement emphasized fresh, local ingredients.

**Immigrant Renaissance (Late 20th Century-Present):**

Immigrants from Asia, Latin America, and other regions have greatly influenced American cuisine. The popularity of sushi, Mexican cuisine, and fusion restaurants reflects this diversity.

**Conclusion:**

American cooking is a reflection of its diverse history and the contributions of countless cultures. From the indigenous peoples' traditions to the fusion of European, African, and Asian influences, American cuisine continues to evolve and adapt. It remains a dynamic and ever-changing culinary landscape, representing the melting pot of cultures that is the United States.

Indian History

Certainly, I can provide you with a brief essay on Indian history within 1000 words. Here's an overview of Indian history:

Title: "A Glimpse into the Tapestry of Indian History"

India's rich and diverse history spans millennia, encompassing numerous dynasties, empires, and cultural transformations. This essay provides a concise overview of Indian history, highlighting key periods and events that have shaped the subcontinent.

**1. Ancient India (circa 2500 BCE - 600 CE)**

Ancient India witnessed the emergence of the Indus Valley Civilization, one of the world's oldest urban civilizations. Around 1500 BCE, Indo-Aryans migrated to the region, contributing to the Vedas, India's earliest religious texts. The Maurya and Gupta Empires flourished, marking periods of political stability and intellectual advancement. The spread of Buddhism and Jainism also originated during this era.

**2. Medieval India (circa 600 CE - 1500 CE)**

The Gupta Empire's decline gave rise to various regional kingdoms. The Cholas, Chalukyas, and Rashtrakutas were among the prominent dynasties. Indian culture continued to flourish, with significant achievements in mathematics, astronomy, and literature, exemplified by the works of scholars like Aryabhata and Kalidasa.

**3. Islamic Invasions and Sultanates (circa 12th - 16th centuries)**

The medieval period witnessed the arrival of Islamic rulers and the establishment of several Sultanates, including the Delhi Sultanate. This era was marked by significant cultural syncretism, with the blending of Hindu and Islamic influences in art, architecture, and cuisine. The Mughal Empire, founded by Babur, rose to prominence during the 16th century.

**4. The Mughal Empire (circa 16th - 18th centuries)**

Under Akbar's rule, the Mughal Empire reached its zenith, fostering a vibrant cultural and intellectual milieu. The Taj Mahal stands as a testament to the architectural grandeur of this era. However, the empire began to decline in the 18th century due to political fragmentation and external invasions.

**5. British Colonial Rule (18th - 20th centuries)**

The British East India Company established control over India in the 18th century, leading to the prolonged period of colonial rule. The struggle for independence, spearheaded by leaders like Mahatma Gandhi, Jawaharlal Nehru, and Subhas Chandra Bose, culminated in India gaining independence in 1947.

**6. Post-Independence India (1947 - present)**

India's post-independence history has been marked by the drafting of a democratic constitution and the establishment of a secular and federal republic. The country has made remarkable progress in various fields, including science, technology, and the economy. India remains a diverse nation with a rich tapestry of languages, religions, and cultures.

**7. Contemporary India**

In the contemporary era, India has emerged as a global player in technology, industry, and politics. Challenges such as poverty, inequality, and environmental concerns persist, but the nation continues to strive for progress and social reform.

In conclusion, Indian history is a vibrant mosaic of cultures, civilizations, and dynasties that have left an indelible mark on the subcontinent and the world. It is a testament to the resilience and adaptability of a nation that has endured and thrived through the ages, and its story continues to unfold in the 21st century.

The Religion of Ashoka: An outstanding unique example of the universal brotherhood in the ancient Indian history

    The religion of Ashoka is an outstanding and unique example of the universal brotherhood in the ancient Indian history. Without religion of Ashoka, the discussion of the ancient Indian history will incomplete. Ashoka is an important part of the ancient Indian history and also in the world history.  Generally, one emperor gives his attention to the politics of his own empire but in the case of Ashoka, he gives his attention to the religious activities and public welfare. Ashoka 'public welfare policy is so relevant to the modern age. Somewhere religion of Ashoka is similar to the public welfare policy. He applied his religious policy to the mass people by some welfare policy. He tried his best to apply the policy of welfare to the mass people. He spread his religious ideas to the over the country. India keeps her contribution to the world history through the ages. The religion of Ashoka is considered a Juel in the world history. On the other hand teaching of Lord Budha massively converted his life. It also converted the state politics of the Muryan empire. 

    Source of history is the most important ingredient in the historical discussion. If the historical source is the short quantity there are so many problems can arise but where the historical source is enough there is a huge possibility of research and analytical discussions. We can know huge information about the Religion of Ashoka from Buddhist religious text or manuscript. Though for the Religion of Ashoka we have found various other sources. So many inscriptions, rock edicts, pillar inscription we have found all over India and through this inscriptions, we can know various aspects of Ashoka's religion. Ashoka established so many rock edicts, pillar inscriptions for wide publicity of his religious idle. We can gather huge information from those and analyse those we can reach to the perfect intrinsic theory. Ashoka had built so many stupas a vihars all over India. We can know more information about the religion of Ashoka those stupas and vihars. But how many similarities between Buddhist religion and religion of Ashoka have it is so arguably among historians. Though Ashoka established his trusts on the Buddhist religion. From minor rock edict, we can know about this.

    Ashoka became the emperor of the Mauryan empire after his father Bindusara. While sitting on the throne he concentrated on the expanding of the empire. He attacks the Kalinga state. And he won the Kalinga state. This war was a remarkable incident in Muryan dynasty and Ashoka's life also. Ashoka's mind was massively changed by the huge loss of life in the Kalinga war. The effect of the Kalinga war gives a deep impression on the mind of Ashoka. He takes initiation of Buddha by the monk Upagupta. It is a myth that Ashoka had to kill his ninety-nine brothers. So his name became Chandashoka. But after the initiation of Lord Buddha, he became 'Dharmashoka'. But there is no historical evidence of the killing of his ninety-nine brothers. Historian says that it is just a myth. 

    The religion of Ashoka was based on the public welfare. He wants to serve people as a father. He has mentioned himself in his rock edicts as the father of mass people. There is a huge description of Ashoka's religion in his inscriptions.By that inscription, he declared his, own religious views for mass people. In the third minor rock edict, he shows his faith in the religion of Lord Buddha. But historians are said that there have some differences between the religion of the Lord Buddha and religion of emperor Ashoka. Ashoka took initiation of Lord Buddha as 'Upasaka'. As soon as he followed the principle of Buddhism, he became a major patron of the Buddhist religion. He constructed many stupas and vihars all over the country. He travelled many places which are related to the life of Lord Buddha and he also established stupa there. He also constructed vihars for the monks of Buddhism. He donates many lands also to the monks. By analysing those activities of Ashoka we can realise that Ashoka was fully devoted to the Buddha and Buddhist Shangh. Through this, we can know the great adherence of Ashoka to the Lord Buddha.
   The religion of Ashoka was considered to be moral, social, and civilised.  He gave special importance to citizen awareness. He has made an incarnation of secularism in social relations, with emphasis on humanity. Ashoka said that social relation should be based on human values.  The religion of Ashoka has been applied to maintain social harmony and social solidarity. In the religion, if Ashoka, religious constrictions have not been tolerated in any way.   He said in his inscription that, all religions must be respectful. It can be said that religion if Ashoka was completely free of narrowness.
   

    

    

What is history

   There is no such thing in the world which has no history. No one can deny this matter in any way. Without a specific history, no knowledge can proceed in practice. In order to practical knowledge about any subject, we must first know the history of this matter. If you advance to a centre of a subject without knowing history, then that knowledge practice will not be incomplete only, it will be limited to learning that knowledge.History has left its signature in every world of knowledge. History is being stored in every knowledge of the world every day. History is not just a calendar of politics and politicians' activities. The roots of history are far beyond and deeply rooted. Every human has a personal history, maybe someone remembers it and nobody remembers it. Human beings are standing on the basis of their past or history. That history can not be denied.
    Every person manages the history stored in their brain with its well-trained mindset and gets knowledge. Everyday human experience is stored in his brain as a daily history for the future. The knowledge that a person receives in the history of synthesis and analysis of stored history in his own brain, he uses to spend his future path. Historians bring the history out of many theories thoroughly. From the personal good and bad experiences of everyday people, who will take the path to the next day's path. Normal people often have to play the role of historians. But the question here can arise that why that history is not documented. It is to be said that all the history is documented which will be useful for the later larger social environment. It can be interpreted in such a way that all history that is not widespread and affects the social environment, all these history is gradually erased.
   Which history would be useful for a larger environment and it would be instructive that the historian did the important work. The significance of any historian is that he accomplished the task of selection of events for the coming day.
   However, there has been considerable change in historical thinking. But the news of happiness is that we have freed history from the boundaries of political events. So history is not just the discussion and analysis of state politics. For example, geologists went on discovering the natural history of the world through their research. They are investigating the geological history of the earth. Similarly, the meteorologist recorded the history of the Earth's climate. Astronomers are exploring the history of the universe. One thing is noticeable that all of them are going to write history.History has dominated the world of science equally. The incredible expanse of history has really surprised us.
   Economics Control the life of people, society and the state. The country's politics are often run by the economy. To regulate and improve the economy of a country, it needs to carry out the economic history of the country and to analyze and study.By the observation and analysis of the economic history, the basis of the country's next day's economy is tolerated by the work of a  historian. How to reform the economy on a firm basis in the future and how it needs to change the fundamentals of the economy, the realization of the history of economic history must be realized and must be resolved through research. The countries which are well-organized economically, know that the economics of those countries are sufficiently analyzed and researched so that the economy improves in the future.Through the history of economic history, planned economy is created.
    The country's legal system protects the country and society. But it is necessary to research the history of the law in order to properly legislate. How the law has been enacted in the past and how the law influenced the people and the broader society and played an effective role, through the analysis and observation of the law, we can see. In the case of international law, we see that the history of international relations is thoroughly reviewed and analyzed, then international law is enacted, because much depends on international relations, the reasons for the international law and its utility. When we review the history, we see that the main reason behind the international war and international disenchantment of the past is the uncontrolled application of international law and this international law is responsible for international unity and sovereignty.So, we can say that the role of history is huge.
    On the other hand, in the case of state politics, we can see that the whole issue is dependent on history. By observing and analyzing the political history, we can easily guess the current state of politics and its nature. By analyzing political history, we can evaluate causality due to the politics of past era and analyze it through its analysis and study and observe the trend of politics in the present age.In order to solve a political problem, it is first to find that such a problem arose in politics and if it has emerged, then how it was resolved.Therefore, ignoring the political history, it can now be said that it is almost impossible to govern politics properly.
    We have reviewed cultural history for the better culture. Classical era culture analysis and research give rise to modern culture. And the future of a new culture is taken into account by the history of how culture affects the society. On the other hand, by analyzing the cultural history, it is also seen how a repressive culture is responsible for the downfall of society.So history teaches us a lot.
    The military history is currently very popular in the study of history. Through the interpretation and analysis of military history, we can understand the consequences of war and the effects of war on people and the country. We have analyzed military history to learn military techniques and to improve the military technology
    Writing religious history in the history of the world is a very important issue. Religion is involved in human life extensively. Religions or religious beliefs involve common people's feelings and through this thought, they are directed towards daily life and social life. It is seen in many times that politics is being influenced by religion. On the other hand, culture is associated with religion. Human culture or social culture can be realized by analyzing and reviewing religious history or religious literature. It can be said that the religious activities represent the public society and the economy of the country. So through the study of religious history, we have a detailed description of the social life. If we review the history of religion, we can analyze the belief of common people and how common people have changed their mind over the ages and why this change has happened.On the other hand, we can analyze the religious history by analyzing the conflict between science and religion. So, for many decades religious history is a very important branch of history.
    Let's talk about the history of philosophy. Philosophy is not just a matter of philosophers. The common people have a philosophy of their own. The philosophy of common people has become a social philosophy, combining them together. And a common man can influence his fundamental philosophical thinking entire society and country, and he became a philosopher in time.Philosophical history is not just a theory of philosophy. There are many elements which are responsible for the development of philosophical theories. These elements influence the mind of the philosophers. Through the history of philosophy, we can identify these elements. We realize that what is the element responsible for the emergence of a philosophical theory. So through the history of philosophy, we can attain the basic formula of philosophical theory.
    History of education is a very important topic.How the education system has changed, and with that change, the analysis of how different elements of the education system have changed, one of the key features of the history of education. In order to improve the education system, we have to look back. After reviewing the history of the education system, we see how human civilization has become gradually educated, and from the primitive era to the present era, how human education has passed the human race, human society educates itself through time.If we review the history of the education system, we will be able to understand both the limitations and excellence of educational system in the past.So now we have to carefully review and synthesize how our education system was introduced and how the education system has evolved and how it has become the current form. So to develop the present education system nicely, we need to analyze the history of our education system and know.
    Food is a part of human life, so the history of eating habits is the history of human life. Reviewing the history of the food of a country can be understood in the country's economic situation and the economic impact of the people in the country. Through the history of food, we can learn the history of food processing and learn about how advanced the process of food processing was at any time.The history of farming is somewhat related to food history. Although the history of farming is another subject. We can know about the nutritional needs of the people of different historical periods through the history of food. On the other hand, through food history, we can see how the personal taste of human beings changed from day to day.
    Medical history is a very interesting topic. Through the history of medical history, we know about the history of public health of different ages. Government policies have a great influence on public health. We can clearly understand the government's attitude towards the people when we examine the government's policies adopted in public health. Besides, through the history of the medical system, we can know the history of various medical techniques and chemical ingredients. By analyzing the history of how medicines are made through chemical or natural ingredients, we get a detailed description of the medical history.Therefore, it is necessary to review the medical history in order to improve the medical system.
    Through this detailed discussion, we have seen there is no such thing that history has not kept its signature, in every case of knowledge, history has left its witness.There are also many other subjects in which history has spread its own. So history cannot be called a combination of political activities only. So today we can say for sure that the spread of history is widespread. History is the organs of everyday life, which I can not ignore in any way. Forgetting history means forgetting the existence. The progress of human civilization will be achieved through the history of civilization. It is necessary to read history for the progress of human civilization.