/r/askscience

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Do heavily forested regions of the world like the eastern United States experience a noticeable difference in oxygen levels/air quality during the winter months when the trees lose all of their leaves?

28273 upvotes • goodyboomboom

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Can my 7 year old ask you about tornadoes?

27363 upvotes • [deleted]

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Does the size of a creature, or the size of its eye, affect what can be seen by the "naked eye"? for example, can ants see things we consider microscopic? are ants microscopic to elephants?

27010 upvotes • Lusiggy

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Why do we have to "fall" asleep? Why can't we just decide to be asleep?

26835 upvotes • SixthGrader

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Have a question about the 2019 novel coronavirus (2019-nCoV)? Ask us here!

26531 upvotes • AskScienceModerator

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Why do nearsighted people need a prescription and a $300 pair of glasses, while farsighted people can buy their glasses at the dollar store?

26342 upvotes • simrc86

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For humans, sea water is not drinkable due to its high salt content. How do whales, manatees, seals, and other sea faring mammals stay hydrated?

26308 upvotes • StarlordDrT

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Many of us haven’t been sick in over a year due to lack of exposure to germs (COVID stay at home etc). Does this create any risk for our immune systems in the coming years?

24360 upvotes • idiomech

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Asked my chemistry teacher (first year of highschool) this "Why do we use the mole (unit) instead of just using the mass (grams) isn't it easier to handle given the fact that we can weigh it easily? why the need to use the mole?" And he said he "doesn't answer to stupid questions"

23932 upvotes • Onigiri22

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If we return to the moon, is there a telescope on earth today strong enough to watch astronauts walking around on the surface?

23648 upvotes • parquet7

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
Do heavily forested regions of the world like the eastern United States experience a noticeable difference in oxygen levels/air quality during the winter months when the trees lose all of their leaves?	28273	goodyboomboom
Can my 7 year old ask you about tornadoes?	27363	[deleted]
Does the size of a creature, or the size of its eye, affect what can be seen by the "naked eye"? for example, can ants see things we consider microscopic? are ants microscopic to elephants?	27010	Lusiggy
Why do we have to "fall" asleep? Why can't we just decide to be asleep?	26835	SixthGrader
Have a question about the 2019 novel coronavirus (2019-nCoV)? Ask us here!	26531	AskScienceModerator
Why do nearsighted people need a prescription and a $300 pair of glasses, while farsighted people can buy their glasses at the dollar store?	26342	simrc86
For humans, sea water is not drinkable due to its high salt content. How do whales, manatees, seals, and other sea faring mammals stay hydrated?	26308	StarlordDrT
Many of us haven’t been sick in over a year due to lack of exposure to germs (COVID stay at home etc). Does this create any risk for our immune systems in the coming years?	24360	idiomech
Asked my chemistry teacher (first year of highschool) this "Why do we use the mole (unit) instead of just using the mass (grams) isn't it easier to handle given the fact that we can weigh it easily? why the need to use the mole?" And he said he "doesn't answer to stupid questions"	23932	Onigiri22
If we return to the moon, is there a telescope on earth today strong enough to watch astronauts walking around on the surface?	23648	parquet7