/r/askscience

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Nitrogen is the most important aspect of most fertilizer and it is highly competed for in some plant ecosystems, but nitrogen is the most common component in air. Why can't plants use nitrogen gas from the air?

1199 upvotes • saad85

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Is the earth still cooling from its formation? If so, does that mean eventually all tectonic activity will cease and our liquid mantle will solidify?

1199 upvotes • cats_on_t_rexes

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Is there a constant "reservoir" of tears prepared for when we cry? If not, where do the tears come from?

1198 upvotes • ItsLewis

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Is there a limit to the number of photons that can exist in a given volume of space?

1198 upvotes • howardcord

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AskScience AMA Series: Kumar Sanjiv, Cancer Researcher

1198 upvotes • HelledayLab

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Where does all of the snot come from when you have a cold?

1198 upvotes • Dunkachin0

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What exactly is going on when a protein (or other molecule) binds with a receptor?

1198 upvotes • Eat-A-Torus

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Why isn't the Oort Cloud planar?

1198 upvotes • platypodus

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Can a bright light outside the visible spectrum hurt your eyes?

1197 upvotes • WitsBlitz

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How do mirrors work on an atomic level? Why is the angle of reflection equal to the angle of incidence?

1196 upvotes • vortexmb

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
Nitrogen is the most important aspect of most fertilizer and it is highly competed for in some plant ecosystems, but nitrogen is the most common component in air. Why can't plants use nitrogen gas from the air?	1199	saad85
Is the earth still cooling from its formation? If so, does that mean eventually all tectonic activity will cease and our liquid mantle will solidify?	1199	cats_on_t_rexes
Is there a constant "reservoir" of tears prepared for when we cry? If not, where do the tears come from?	1198	ItsLewis
Is there a limit to the number of photons that can exist in a given volume of space?	1198	howardcord
AskScience AMA Series: Kumar Sanjiv, Cancer Researcher	1198	HelledayLab
Where does all of the snot come from when you have a cold?	1198	Dunkachin0
What exactly is going on when a protein (or other molecule) binds with a receptor?	1198	Eat-A-Torus
Why isn't the Oort Cloud planar?	1198	platypodus
Can a bright light outside the visible spectrum hurt your eyes?	1197	WitsBlitz
How do mirrors work on an atomic level? Why is the angle of reflection equal to the angle of incidence?	1196	vortexmb