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What are some of the most famous scientific theories?

The theory of heliocentrism was posited by Copernicus in 1543. Essentially, Copernicus believed that the earth revolved around the sun. The idea was conceived by ancient Greek thinkers, but it took nearly 2,000 years for Copernicus to put their initial thoughts into a theory.Charles Darwin's 1859 theory of evolution by natural selection holds that life evolved instead of being created. His theory cast supernatural creation aside and paved the way for scientific thoughts on man's beginnings.Quantum theory was developed by Albert Einstein with Max Planck, Erwin Schrodinger, Werner Heis..

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How long did Anne Frank and her family hide?

One of the first things that Anne Frank and her family did upon moving into the Secret Annex was to make curtains for the room to keep them hidden. Anne and her father tidied up the room and arranged it, while her mother and sister rested on beds. A second family, the Van Pels, moved into the hiding area a week later. An eighth person, Fritz Pfeffer, entered into hiding just four months later.

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Who invented the phonograph?

Realizing he could record sound on foil-coated cylinders, Edison created a machine with single needles for recording and playback. By speaking into the mouthpiece, Edison was able to indent the sound vibrations of his voice into the cylinder through the recording needle. The first phrase spoken into the machine by the inventor was "Mary had a little lamb." Public fascination with his discovery earned him the nickname "The Wizard of Menlo Park," after the city in which he did much of his work.

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How many World War II veterans are still alive?

In June 2013, there were approximately 1.7 million veterans of World War II alive. Nineteen years earlier, 10.7 million of the 16 million American World War II veterans were still alive. By 2024, an estimated 81,117 veterans may be alive, according to VA statistics. By comparison, the last World War I veteran died in February 2011, nearly 100 years after the conflict.

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What was the name of the king of Spain in the year of 1492?

Ferdinand V was crowned King of Sicily in 1468. The following year he took a wife, Princess Isabella of Castile. For the next 23 years, he struggled to keep his power. In the spring of 1492, he made a final push against the Muslim kingdom of Granada. Due to its surrender, he was elevated to King of Spain in its entirety.

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Why did the United States enter World War 1?

U.S. President Woodrow Wilson at first sought to remain neutral when World War I began in 1914. However, friction with Germany intensified when Germany created a naval blockade of England, hindering its trade with the United States. In 1915, Germany announced that it would attack all ships trying to run the blockade. In early 1915, Germany sank a private U.S. ship William P. Frye, and soon after, it sank the Lusitania, killing 1,201 people, among them 128 Americans. Despite a 1916 pledge to ensure passenger safety, Germany continued to sink unarmed ships, resulting in the loss of more American..

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What is a good resource to learn more about railroad history?

The Railway and Locomotive Historical Society, Inc. also offers a history journal and is known as "the oldest railroad history organization in North America." Railroad survey maps and information about what companies purchased and built is also available through the Library of Congress. Fun facts are also available on the Independence Hall Association website, such as the fact that 20,000 men worked on the first transcontinental railroad in the U.S. putting in almost 240,000 working hours.

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What is the Pax Mongolica?

Having managed to claim vast land in Asia, the Mongols were able to ensure the security of travelers. It also helped to improve communication between different empires on their land. Even though there were some issues among the Mongols, they could not risk the importance of travelers and trade for the sake of their differences. Their expansion and growth led to the spread of gun powder, money and paper to the rest of the world.

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What are some quotes from Abraham Lincoln?

The Gettysburg Address, delivered at the dedication ceremony for Pennsylvania’s National Cemetery of Gettysburg, was just 273 words long, but historians widely consider it to be one of the most influential speeches in American history for its evocation of the ideals of human equality.\nThe introduction in Lincoln’s Gettysburg Address, stating his belief that the nation was dedicated to the proposition that all men are created equal, was an ideal derived from the Declaration of Independence and one that Lincoln believed the founding fathers intended. His interpretation, seen as a radical on..

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Who was Henry Hudson's wife?

Henry Hudson made four voyages, but his most famous voyage, in which he discovered the bay and straight which bear his name, was also his last. By June 1611, the crew of the Discovery had been at sea for over a year. Facing scurvy, short rations and a long voyage back to England, Hudson's crew mutinied. Nine crew members, including Hudson and his son, were set adrift in a lifeboat in the very bay Hudson discovered.

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