/r/askscience

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Why does saliva have a positive healing effect on cuts and bruises on the skin but a negative effect at healing dry lips?

972 upvotes • wually

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Since time moves relatively slower where gravity is stronger, if you have two twins the work in the same sky scraper their whole life, would the one who works on the bottom floor age slower than the one who works on the top floor?

972 upvotes • pammy678

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If a space elevator is ever created and reaches ISS, 249 miles up in low earth orbit, what would happen if I stepped off? Would I remain geostationary with the Earth or start to orbit?

972 upvotes • itslookingatmeray

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Why do we use factorial to get possible combinations in the card deck?

972 upvotes • Tonda9

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When photons become red-shifted because of the universe's expansion, where does the photon's energy go?

972 upvotes • Three_Inch

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How do Saturn's rings spin in relation to the planet's spin?

972 upvotes • coconut7272

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If a mother is malnourished during childhood, will it affect a baby she has later in life?

971 upvotes • Excellent-Demand-193

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How long did our teeth last before the invention of toothbrushes?

970 upvotes • groomingfluid

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How much, if at all, is the surface of the Earth warmed by its own core?

970 upvotes • MaxTheRed

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Does lightning striking water (lakes/ocean/etc) kill/harm fish?

970 upvotes • jbm222

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
Why does saliva have a positive healing effect on cuts and bruises on the skin but a negative effect at healing dry lips?	972	wually
Since time moves relatively slower where gravity is stronger, if you have two twins the work in the same sky scraper their whole life, would the one who works on the bottom floor age slower than the one who works on the top floor?	972	pammy678
If a space elevator is ever created and reaches ISS, 249 miles up in low earth orbit, what would happen if I stepped off? Would I remain geostationary with the Earth or start to orbit?	972	itslookingatmeray
Why do we use factorial to get possible combinations in the card deck?	972	Tonda9
When photons become red-shifted because of the universe's expansion, where does the photon's energy go?	972	Three_Inch
How do Saturn's rings spin in relation to the planet's spin?	972	coconut7272
If a mother is malnourished during childhood, will it affect a baby she has later in life?	971	Excellent-Demand-193
How long did our teeth last before the invention of toothbrushes?	970	groomingfluid
How much, if at all, is the surface of the Earth warmed by its own core?	970	MaxTheRed
Does lightning striking water (lakes/ocean/etc) kill/harm fish?	970	jbm222