/r/askscience

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Why does HIV spread only via some body fluids? i.e. why does it spread via blood and breast milk but not via saliva and tears?

517 upvotes • JerseyCity_NewYork

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If I was standing on the surface of Europa, how bright would the day be, comparatively to earth? Would Jupiter's vastness in it's Horizon compensate in reflective lighting for the large distance away from the sun?

517 upvotes • [deleted]

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Can wind interfere with sound waves?

517 upvotes • davidvillar

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How does the Large Hadron Collider work?

517 upvotes • OinkGoesPig

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How far away could SETI detect Earth?

517 upvotes • Agarax

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How does quantum tunneling work?

517 upvotes • HiroyashiDr

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How does the expression of DNA change during puberty?

517 upvotes • spudfolio

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Are there caves on Mars?

516 upvotes • chipbuddy

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How true is the adage "Red sky at night, sailor's delight. Red sky at morning, sailor's take warning."? If true, why?

516 upvotes • Clean_n_Press

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Will a Tesla eventually not hold its charge as long?

516 upvotes • boomrazzle

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
Why does HIV spread only via some body fluids? i.e. why does it spread via blood and breast milk but not via saliva and tears?	517	JerseyCity_NewYork
If I was standing on the surface of Europa, how bright would the day be, comparatively to earth? Would Jupiter's vastness in it's Horizon compensate in reflective lighting for the large distance away from the sun?	517	[deleted]
Can wind interfere with sound waves?	517	davidvillar
How does the Large Hadron Collider work?	517	OinkGoesPig
How far away could SETI detect Earth?	517	Agarax
How does quantum tunneling work?	517	HiroyashiDr
How does the expression of DNA change during puberty?	517	spudfolio
Are there caves on Mars?	516	chipbuddy
How true is the adage "Red sky at night, sailor's delight. Red sky at morning, sailor's take warning."? If true, why?	516	Clean_n_Press
Will a Tesla eventually not hold its charge as long?	516	boomrazzle