/u/Ndemco's posts in /r/askscience
COVID-19 started with one person getting infected and spread globally: doesn't that mean that as long as there's at least one person infected, there is always the risk of it spiking again? Even if only one person in America is infected, can't that person be the catalyst for another epidemic?
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If you could drill a hole and make a protective tube that goes through the center of the earth to the other side, what would happen if you jumped through, after hitting the center?
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What are the chances that billions of years ago Mars was an earth-like planet and inhabited by intelligent life, but the intelligent life exhausted the planet of its resources and destroyed most of the atmosphere and that's why it looks that way it does now?
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