/r/askscience

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How serious would a medical situation aboard the ISS have to be before space agencies would consider using one of the docked Soyuz craft to bring the involved astronaut(s) home? Could it be done in time?

599 upvotes • RoflCopter4

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Is every speck of light in this picture a star?

599 upvotes • [deleted]

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How much variation is there in the "220 minus your age" rule-of-thumb for max heart rate?

599 upvotes • iorgfeflkd

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Has the invention of the light bulb lead to any measurable evolutionary changes among moths or other night light-obsessed insects?

599 upvotes • formula_F300

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Why do rings form according to the axis of a planet and not randomly?

599 upvotes • yhhgg

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Canada decided to delay second doses by up to four months due to lack of supply. Will this time frame leave us less protected?

599 upvotes • sohlasystem

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Can the back action propagation in a neuron spread from the dendride to the axon of another neuron through the synapse?

599 upvotes • Silly_Commercial_514

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Do carbonated beverages such as soda help keep you hydrated? If so, how do they compare against water?

598 upvotes • formad12

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Is my friend’s tattoo correct?

598 upvotes • csswizardry

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How do trees live for such a long time?

598 upvotes • Escalade213

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
How serious would a medical situation aboard the ISS have to be before space agencies would consider using one of the docked Soyuz craft to bring the involved astronaut(s) home? Could it be done in time?	599	RoflCopter4
Is every speck of light in this picture a star?	599	[deleted]
How much variation is there in the "220 minus your age" rule-of-thumb for max heart rate?	599	iorgfeflkd
Has the invention of the light bulb lead to any measurable evolutionary changes among moths or other night light-obsessed insects?	599	formula_F300
Why do rings form according to the axis of a planet and not randomly?	599	yhhgg
Canada decided to delay second doses by up to four months due to lack of supply. Will this time frame leave us less protected?	599	sohlasystem
Can the back action propagation in a neuron spread from the dendride to the axon of another neuron through the synapse?	599	Silly_Commercial_514
Do carbonated beverages such as soda help keep you hydrated? If so, how do they compare against water?	598	formad12
Is my friend’s tattoo correct?	598	csswizardry
How do trees live for such a long time?	598	Escalade213