In the third century BCE, Apollonius of Perga asked how many circles one could draw that would touch three given circles at exactly one point each. It would take 1,800 years to prove the answer: eight ...
In the late 1980s, the Biosphere 2 project sealed a team of scientists inside a self-sustaining miniature world. Their goal was to see if a closed system could support human life, serving as a ...
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