/u/Mary_Pick_A_Ford's posts in /r/askscience

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Can someone ELI5 what exactly are "rare earth" elements and what they are used for? Also is it possible for the periodic table of elements to grow larger?

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What exactly are "rare earth" elements on the periodic table and what they are used for?

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If there were only 100 humans left on Earth, would it be better to have (99 females, 1 male)or (99 males, 1 female)?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Can someone ELI5 what exactly are "rare earth" elements and what they are used for? Also is it possible for the periodic table of elements to grow larger?	1
What exactly are "rare earth" elements on the periodic table and what they are used for?	1
If there were only 100 humans left on Earth, would it be better to have (99 females, 1 male)or (99 males, 1 female)?	1