/r/askscience

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If helium keeps floating up and up, how do we still have helium left on Earth after more than a billion years? Also, helium is a gas. Where do you actually go to find helium on Earth?

616 upvotes • Nate_TeamBST

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Just how much better are electronic toothbrushes at cleaning than regular toothbrushes?

615 upvotes • APottedPlant

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Has the invent of traffic tracking/auto rerouting in modern satnav/mobile phone navigation systems caused a demonstrable difference in traffic levels from say 15 years ago?

615 upvotes • theangrytramp

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AskScience AMA Series: We are Cosmologists, Experts on the Cosmic Microwave Background, Large-Scale Structure, Dark Matter, Dark Energy and much more! Ask Us Anything!

615 upvotes • AskScienceModerator

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Can deaf people hear the sound of crunchy food through their head while they eat?

614 upvotes • OgreS13

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Is there a spot in the universe that light has not traveled to yet?

614 upvotes • mckelroy88

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What makes some contact lenses able to be used for a year, and others last for only months or a day?

614 upvotes • needoptionsnow

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Why prime numbers (and only them AFAIK) are giving me this plot?

614 upvotes • karoltomala

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Most "genetically distant" human population?

613 upvotes • cakesthecake

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What exactly is it about smoking that causes all the negative repercussions? Is it the smoke? The nicotine or tar? Is an electronic cigarette a safer method?

613 upvotes • baby0blues

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
If helium keeps floating up and up, how do we still have helium left on Earth after more than a billion years? Also, helium is a gas. Where do you actually go to find helium on Earth?	616	Nate_TeamBST
Just how much better are electronic toothbrushes at cleaning than regular toothbrushes?	615	APottedPlant
Has the invent of traffic tracking/auto rerouting in modern satnav/mobile phone navigation systems caused a demonstrable difference in traffic levels from say 15 years ago?	615	theangrytramp
AskScience AMA Series: We are Cosmologists, Experts on the Cosmic Microwave Background, Large-Scale Structure, Dark Matter, Dark Energy and much more! Ask Us Anything!	615	AskScienceModerator
Can deaf people hear the sound of crunchy food through their head while they eat?	614	OgreS13
Is there a spot in the universe that light has not traveled to yet?	614	mckelroy88
What makes some contact lenses able to be used for a year, and others last for only months or a day?	614	needoptionsnow
Why prime numbers (and only them AFAIK) are giving me this plot?	614	karoltomala
Most "genetically distant" human population?	613	cakesthecake
What exactly is it about smoking that causes all the negative repercussions? Is it the smoke? The nicotine or tar? Is an electronic cigarette a safer method?	613	baby0blues