/r/askscience

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How far away from Earth would you be able to detect human presence?

640 upvotes • e1_duder

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Can mosquitoes die if they bite someone with a high blood-alcohol level?

640 upvotes • amitpop

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Why can I only move my eyes in an incremental, fragmented motion when looking in a direction, but move them in a smooth, tracking motion when I'm watching something move?

640 upvotes • PetersonPersuasion

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What causes the "bags" under your eyes when you're tired?

640 upvotes • dickflap

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What temperature would be required for a modern match to spontaneously ignite under normal atmospheric conditions?

640 upvotes • SatanicMushroom

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How do we know pi is never-ending and non-repeating if we're still in the middle of calculating it?

639 upvotes • butwhatwilliwear

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As a saying in my country goes, when a flesh wound with scab starts itching, it means it has started healing (or is in final stages of it). How scientifically true is this claim?

639 upvotes • achshar

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Are all the stars we can see with naked eyes part of the Milky way galaxy?

639 upvotes • SpookyWookiee

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What would happen if humanity lost genetic variation?

639 upvotes • bigmakbc

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How do firefighters put out fire on top floors of skyscrapers?

639 upvotes • Gaumir

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
How far away from Earth would you be able to detect human presence?	640	e1_duder
Can mosquitoes die if they bite someone with a high blood-alcohol level?	640	amitpop
Why can I only move my eyes in an incremental, fragmented motion when looking in a direction, but move them in a smooth, tracking motion when I'm watching something move?	640	PetersonPersuasion
What causes the "bags" under your eyes when you're tired?	640	dickflap
What temperature would be required for a modern match to spontaneously ignite under normal atmospheric conditions?	640	SatanicMushroom
How do we know pi is never-ending and non-repeating if we're still in the middle of calculating it?	639	butwhatwilliwear
As a saying in my country goes, when a flesh wound with scab starts itching, it means it has started healing (or is in final stages of it). How scientifically true is this claim?	639	achshar
Are all the stars we can see with naked eyes part of the Milky way galaxy?	639	SpookyWookiee
What would happen if humanity lost genetic variation?	639	bigmakbc
How do firefighters put out fire on top floors of skyscrapers?	639	Gaumir