/r/askscience

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Can a person test negative for COVID, but still be contagious? (Assuming that person is in the process of being COVID positive)

7928 upvotes • whoneedsusernames

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Was the 1918 H1N1 virus the "source" for the 1957 H2N2, 1968 H3N2, and the seasonal flu that comes around each year?

7903 upvotes • Farmher315

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How do we know the age of the universe, specifically with a margin of error of 59 million years?

7902 upvotes • citizenofdalaran

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What’s stopping the water in lakes from seeping into the soil and ‘disappearing’?

7895 upvotes • weh_town

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What population density could t-rex realistically have had?

7892 upvotes • CosineDanger

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In the Seinfeld episode "The Junior Mint", Jerry and Kramer are watching an operation of a man who gets his spleen removed. Kramer is eating Junior Mints, and fumbles one that drops into the cavity of the patient, unbeknownst to the doctors. What outcome would a patient have IRL if this happened?

7886 upvotes • peternorthstar

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If you transplanted a multi-decade old tree from a place like say Florida to up north, would the tree “know” to lose it’s leaves in the fall or would it just die?

7884 upvotes • nothriftshoppers

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Do we defecate our food in the order of which we ate it?

7876 upvotes • yjlam

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Was there a decrease in other infectious diseases other than Covid due to wearing masks during the past two years?

7873 upvotes • Belliqueux

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Wilderness can be a rough place, do wild animals commonly suffer from anything like PTSD or anxiety?

7870 upvotes • rm999

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
Can a person test negative for COVID, but still be contagious? (Assuming that person is in the process of being COVID positive)	7928	whoneedsusernames
Was the 1918 H1N1 virus the "source" for the 1957 H2N2, 1968 H3N2, and the seasonal flu that comes around each year?	7903	Farmher315
How do we know the age of the universe, specifically with a margin of error of 59 million years?	7902	citizenofdalaran
What’s stopping the water in lakes from seeping into the soil and ‘disappearing’?	7895	weh_town
What population density could t-rex realistically have had?	7892	CosineDanger
In the Seinfeld episode "The Junior Mint", Jerry and Kramer are watching an operation of a man who gets his spleen removed. Kramer is eating Junior Mints, and fumbles one that drops into the cavity of the patient, unbeknownst to the doctors. What outcome would a patient have IRL if this happened?	7886	peternorthstar
If you transplanted a multi-decade old tree from a place like say Florida to up north, would the tree “know” to lose it’s leaves in the fall or would it just die?	7884	nothriftshoppers
Do we defecate our food in the order of which we ate it?	7876	yjlam
Was there a decrease in other infectious diseases other than Covid due to wearing masks during the past two years?	7873	Belliqueux
Wilderness can be a rough place, do wild animals commonly suffer from anything like PTSD or anxiety?	7870	rm999