/r/askscience

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Is a cure for tinnitus actively being worked on by anyone? And if so, what progress has been made?

15663 upvotes • mwjt42

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The last time atmospheric CO2 levels were this high the world was 3-6C warmer. So how do scientists believe we can keep warming under 2C?

15601 upvotes • s0cks_nz

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If the Niagara falls is frozen where does all the water go behind it? Does it just spill over and flood surrounding land

15545 upvotes • Bens_Worx

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Do animals have blood types like we do?

15543 upvotes • Pepsi_Cola64

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Why do dogs have such extreme diversity in size, shape, and attributes when compared to cats?

15530 upvotes • kuuzo

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Are humans closer in relative size to the planck length or the entire observable universe?

15373 upvotes • Settl

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So atmospheric CO2 levels just reached 410 ppm, first time in 3 million years it's been that high. What happened 3 million years ago?

15360 upvotes • Bluest_waters

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I just looked at the sun with my eclipse glasses, and there are two black dots on the sun. What are those?

15304 upvotes • supaiderman

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If iron loses it's magnetism around 800 degrees C, how can the earth's core, at ~6000 degrees C, be magnetic?

15171 upvotes • BeanBayFrijoles

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How do women astronauts deal with periods in antigravity?

15152 upvotes • FoxtrotQS

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
Is a cure for tinnitus actively being worked on by anyone? And if so, what progress has been made?	15663	mwjt42
The last time atmospheric CO2 levels were this high the world was 3-6C warmer. So how do scientists believe we can keep warming under 2C?	15601	s0cks_nz
If the Niagara falls is frozen where does all the water go behind it? Does it just spill over and flood surrounding land	15545	Bens_Worx
Do animals have blood types like we do?	15543	Pepsi_Cola64
Why do dogs have such extreme diversity in size, shape, and attributes when compared to cats?	15530	kuuzo
Are humans closer in relative size to the planck length or the entire observable universe?	15373	Settl
So atmospheric CO2 levels just reached 410 ppm, first time in 3 million years it's been that high. What happened 3 million years ago?	15360	Bluest_waters
I just looked at the sun with my eclipse glasses, and there are two black dots on the sun. What are those?	15304	supaiderman
If iron loses it's magnetism around 800 degrees C, how can the earth's core, at ~6000 degrees C, be magnetic?	15171	BeanBayFrijoles
How do women astronauts deal with periods in antigravity?	15152	FoxtrotQS