/r/askscience

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In an absolute vacuum, does the diameter of a laser beam change over distance?

4957 upvotes • OculoDoc

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When I see a blurry gas above a bonfire or charcoal grill, what is causing the blurriness? It is colorless and transparent, but makes whatever I see behind it appear blurry in a wavy way. Is it carbon dioxide? Carbon monoxide? H? O? HO?

4956 upvotes • grew_up_on_reddit

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How do we know the core of the Earth is hot?

4956 upvotes • Lil-Shrimp-Gang

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Do ticks or other blood sucking bugs (mosquitoes, etc) show preference to certain people?

4948 upvotes • WillyD15

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Can elephants breath through their mouth ?

4945 upvotes • Vnnncnnnt

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Can we use Moons gravity to generate electricity?

4942 upvotes • noximo

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Does carbonating a liquid alter the ph level of it?

4942 upvotes • Bcm980

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Do bees socialize with bees from other hives?

4939 upvotes • TheTedd

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Are there diseases which can transfer from plants to animals?

4937 upvotes • 7Hielke

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Does the sun have tides?

4937 upvotes • Nazgul044

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
In an absolute vacuum, does the diameter of a laser beam change over distance?	4957	OculoDoc
When I see a blurry gas above a bonfire or charcoal grill, what is causing the blurriness? It is colorless and transparent, but makes whatever I see behind it appear blurry in a wavy way. Is it carbon dioxide? Carbon monoxide? H? O? HO?	4956	grew_up_on_reddit
How do we know the core of the Earth is hot?	4956	Lil-Shrimp-Gang
Do ticks or other blood sucking bugs (mosquitoes, etc) show preference to certain people?	4948	WillyD15
Can elephants breath through their mouth ?	4945	Vnnncnnnt
Can we use Moons gravity to generate electricity?	4942	noximo
Does carbonating a liquid alter the ph level of it?	4942	Bcm980
Do bees socialize with bees from other hives?	4939	TheTedd
Are there diseases which can transfer from plants to animals?	4937	7Hielke
Does the sun have tides?	4937	Nazgul044