/r/askscience

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Why are the "I'm not a robot" captcha checkboxes separate from the actual action button? Why can't the button itself do the human detection?

4312 upvotes • koleslaw

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Why do skydivers have a greater terminal velocity when wearing lead weight belts?

4309 upvotes • 10-46

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Is there any limit to the mass of an object in the universe? Can something, like a black hole, become so massive that it can rip through the fabric of spacetime, or would physics prevent that, or is there no upper limit to the mass an object can be?

4307 upvotes • JimBobBoBubba

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Why do kangaroos lick my car?

4306 upvotes • InfiniteV

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If large atoms are formed in stars and then spread out in the universe, why are heavy metals found in high concentrations, rather than distributed evenly, throughout the earth?

4306 upvotes • 098706

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Does the brain undergo physiological changes while depressed? If so what kind of changes specifically?

4305 upvotes • Wise_Invite_3575

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Why is the COVID-19 vaccine deemed safe for the fetus inside a pregnant woman but not for children under the age of 5?

4302 upvotes • Illustrious_Car2992

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If you went closer toward the center of the earth, would there be less gravity or more gravity?

4301 upvotes • Creeperofhope

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Does a collection of photons in a box (with perfectly reflective walls) have a well defined temperature?

4297 upvotes • ciraodamassa

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The ocean is full of plastics: What are the primary sources of these plastics?

4296 upvotes • Lokarin

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
Why are the "I'm not a robot" captcha checkboxes separate from the actual action button? Why can't the button itself do the human detection?	4312	koleslaw
Why do skydivers have a greater terminal velocity when wearing lead weight belts?	4309	10-46
Is there any limit to the mass of an object in the universe? Can something, like a black hole, become so massive that it can rip through the fabric of spacetime, or would physics prevent that, or is there no upper limit to the mass an object can be?	4307	JimBobBoBubba
Why do kangaroos lick my car?	4306	InfiniteV
If large atoms are formed in stars and then spread out in the universe, why are heavy metals found in high concentrations, rather than distributed evenly, throughout the earth?	4306	098706
Does the brain undergo physiological changes while depressed? If so what kind of changes specifically?	4305	Wise_Invite_3575
Why is the COVID-19 vaccine deemed safe for the fetus inside a pregnant woman but not for children under the age of 5?	4302	Illustrious_Car2992
If you went closer toward the center of the earth, would there be less gravity or more gravity?	4301	Creeperofhope
Does a collection of photons in a box (with perfectly reflective walls) have a well defined temperature?	4297	ciraodamassa
The ocean is full of plastics: What are the primary sources of these plastics?	4296	Lokarin