/r/askscience

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If elements like Radium have very short half lives (3 Days), how do we still have Radium around?

1268 upvotes • Bipedial

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Beta-blockers help dilate the blood vessels, but yet EP and NE cause vasodilation when they attach to beta-2-adrenergic receptors. Does that mean there are little to no Beta-2 receptors in the peripheral vessels, or does it mean less catecholamines bind to alpha 1 and alpha 2 receptors?

1268 upvotes • YourFinestPotions

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How does radiation or proton therapy get rid of cancer cells?

1267 upvotes • ViscousFluid

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How are musical tastes developed? And do musical tastes necessarily have an effect on how a person behaves or acts?

1265 upvotes • VeinyPickle

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Why aren’t waterfalls just eroded to slopes?

1265 upvotes • wjgdinger

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Why don't cleaner fish get infected by parasites from the fish they help to clean?

1264 upvotes • righteous_potions_wi

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Why do raw eggs in their shell last longer than cooked eggs in their shell? What is it about the cooking process that makes the egg spoil quicker?

1264 upvotes • ilikepai

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How does an electron microscope produce an image?

1264 upvotes • catdoctor

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Does extreme sleep deprivation cause hallucinations, and if yes, how/why?

1263 upvotes • mctuking11

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If a stalactite or stalagmite were constantly exposed to air currents as they formed, would they grow in a slanted or curved direction?

1263 upvotes • Legendtamer47

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
If elements like Radium have very short half lives (3 Days), how do we still have Radium around?	1268	Bipedial
Beta-blockers help dilate the blood vessels, but yet EP and NE cause vasodilation when they attach to beta-2-adrenergic receptors. Does that mean there are little to no Beta-2 receptors in the peripheral vessels, or does it mean less catecholamines bind to alpha 1 and alpha 2 receptors?	1268	YourFinestPotions
How does radiation or proton therapy get rid of cancer cells?	1267	ViscousFluid
How are musical tastes developed? And do musical tastes necessarily have an effect on how a person behaves or acts?	1265	VeinyPickle
Why aren’t waterfalls just eroded to slopes?	1265	wjgdinger
Why don't cleaner fish get infected by parasites from the fish they help to clean?	1264	righteous_potions_wi
Why do raw eggs in their shell last longer than cooked eggs in their shell? What is it about the cooking process that makes the egg spoil quicker?	1264	ilikepai
How does an electron microscope produce an image?	1264	catdoctor
Does extreme sleep deprivation cause hallucinations, and if yes, how/why?	1263	mctuking11
If a stalactite or stalagmite were constantly exposed to air currents as they formed, would they grow in a slanted or curved direction?	1263	Legendtamer47