Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
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A monk had once written over a book that contained information about calculus that was written by Archimedes in ancient Greece that could have made us 100 or even 1000 years more mathematically and technologically advanced.
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Romans used a plant called Silphium as contraception. They had so much sex that they drove it into extinction.
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The world's first Buddhist ruler, Emperor Ashoka, who ruled India from 274-232 BCE, was the first ruler in human history to ban slavery, the death penalty, animal cruelty, and deforestation. He even advocated gender equality in education and religious institutions.
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Leonardo Da Vinci loved animals so much that he used to buy caged animals at the market just to set them free.
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