/r/askscience

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Does a cat purr manually or automatically? Is it aware of it's own purring? Does purring have an effect on the cat?

12301 upvotes • stexski

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Why does hitting the top of a bottle of beer with another bottle of beer create that much froth?

12151 upvotes • RedditorBoi

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What would be a "realistic" reason for aliens to invade? Are there any natural substances common on earth that are rare on a galactic scale?

12122 upvotes • Jon_Martensen

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As we begin covering the planet with solar panels, some energy that would normally bounce back into the atmosphere is now being absorbed. Are their any potential consequences of this?

12113 upvotes • roamingandy

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If you were to randomly find a playing card on the floor every day, how many days would it take to find a full deck?

12083 upvotes • Eddie_shoes

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How do pilots know during a flight when there is turbulence coming? They turn on the fasten seat belt sign, and then it gets bumpy. The turbulence ends, and then they turn off the fasten seat belt sign.

12034 upvotes • bawledannephat

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When did people realize that a whip crack was breaking the sound barrier? What did people think was causing that sound before then?

12022 upvotes • diald4dm

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Does an obese person have more blood in their body than a person with a optimal body mass index?

12022 upvotes • henry_west

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Why can hormone therapy make a clitoris grow but can't make a penis grow?

12011 upvotes • MustacheMountain

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Why is the Chernobyl New Safe Confinement only rated to last 100 years? What happens after 100 years pass? What determines how long it lasts?

12010 upvotes • EfficientSail0

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
Does a cat purr manually or automatically? Is it aware of it's own purring? Does purring have an effect on the cat?	12301	stexski
Why does hitting the top of a bottle of beer with another bottle of beer create that much froth?	12151	RedditorBoi
What would be a "realistic" reason for aliens to invade? Are there any natural substances common on earth that are rare on a galactic scale?	12122	Jon_Martensen
As we begin covering the planet with solar panels, some energy that would normally bounce back into the atmosphere is now being absorbed. Are their any potential consequences of this?	12113	roamingandy
If you were to randomly find a playing card on the floor every day, how many days would it take to find a full deck?	12083	Eddie_shoes
How do pilots know during a flight when there is turbulence coming? They turn on the fasten seat belt sign, and then it gets bumpy. The turbulence ends, and then they turn off the fasten seat belt sign.	12034	bawledannephat
When did people realize that a whip crack was breaking the sound barrier? What did people think was causing that sound before then?	12022	diald4dm
Does an obese person have more blood in their body than a person with a optimal body mass index?	12022	henry_west
Why can hormone therapy make a clitoris grow but can't make a penis grow?	12011	MustacheMountain
Why is the Chernobyl New Safe Confinement only rated to last 100 years? What happens after 100 years pass? What determines how long it lasts?	12010	EfficientSail0