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The Peloponnesian War ended
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Democritus introduces the concept of the "atom." Interesting fact about Democritus is that he was a Greek philosopher, teacher, and he was born in Abdura.
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The picture showes that Democritus believed that almost the entire universe was made up of "atoms."
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Richard the Lionhearted died of an arrow wound while besieging Chalus in Western France
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Christopher Columbus "discovered" America
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The French Revolution begins
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The Confederacy defeated the North's soldiers that were stationed at Fort Sumner and started the Civil War by doing so
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J.J. Thomson discovered that atoms have electrons. Interesting facts about Thomson is that he gave six lectures at Yale Univeristy on electricity and matter.
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The picture shows the Cathode-Ray Tube experiment that J.J. Thomson used to discover the electron
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Ernest Rutherford discovered that atoms have a nucleus. Interesting facts about Rutherford is that he he was a New Zealand chemist, and he won the Nobel Prize in chemistry.
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The picture shows the Plum Pudding Model that Ernest Rutherford used to discover that atoms have a nucleus
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Niela Bohr discovered that atoms are at different energy levels. Interesting facts about Bohr is that he worked with Einstein and he was an advisor to the Manhattan Project which produced the first atomic bomb.
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The picture shows the Bohr Model of the atom, which showed that atoms are at different energy levels
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Erwin Schrodinger discovered that electrons move in orbitals. Interesting facts about Schrodinger is that he won a Nobel Prize, he was friends with Einstein, and his dad was a botanist.
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The picture displays the Schrodinger Equation, which could be used to calculate the orbital that an electron is located on
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James Chadwick discovered that there are protons and neutrons in the nucleus. Interesting facts about Chadwick is that he wanted to study mathematics as an undergraduate, but he go in the registration line for physics by accident.
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The picture shows the gold foil experiment, which James Chadwick used to discover that there are protons and neutrons in the nucleus
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The Arabic scholar Al-Khwarizmi invented Alegebra
