/u/[deleted]'s posts in /r/askscience
All religion aside, is it even possible for two people to populate the world? Or would the birth defects eventually become so crippling and damaging that they would die out?
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With the element radium being so rare, only a few kilograms total being mined over time, how did it make it into so many different consumer products, from watch dials to health elixirs?
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