/r/askscience

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If a reflection hologram is recorded using coherent laser light, why do some areas appear out of focus?

928 upvotes • yabaitanidehyousu

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Why wouldn't matter falling into a black hole decrease entropy in the universe?

927 upvotes • servel333

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What causes gum to have a consistency threshold? You chew for hours with the same consistency then it suddenly becomes gritty, loses all its stickyness, and starts to dissolve in your mouth within seconds.

927 upvotes • Zannyth

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[Moderator Announcement] Meta thread, call for discussion and the state of the Subreddit. Come look and discuss!

926 upvotes • GeoManCam

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When something on our body hurts, why does holding it make it feel better?

926 upvotes • speedlimits65

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How accurate are total Earth population estimates and how do they determine them?

926 upvotes • pledge42

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How long does it take for protons to return to being randomly oriented after an MRI scan?

926 upvotes • ten_mile_river

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Are there any health risks associated with breathing pure oxygen for extended periods?

925 upvotes • walczyk

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Does counting "one-one thousand, two-one thousand..." after seeing a flash of lightning until you hear thunder actually give you a good estimate how far away you are from the flash?

925 upvotes • MikeSupertramp

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Reddit, are you ready for my glass challange, I need your help!

924 upvotes • damnyouglass

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
If a reflection hologram is recorded using coherent laser light, why do some areas appear out of focus?	928	yabaitanidehyousu
Why wouldn't matter falling into a black hole decrease entropy in the universe?	927	servel333
What causes gum to have a consistency threshold? You chew for hours with the same consistency then it suddenly becomes gritty, loses all its stickyness, and starts to dissolve in your mouth within seconds.	927	Zannyth
[Moderator Announcement] Meta thread, call for discussion and the state of the Subreddit. Come look and discuss!	926	GeoManCam
When something on our body hurts, why does holding it make it feel better?	926	speedlimits65
How accurate are total Earth population estimates and how do they determine them?	926	pledge42
How long does it take for protons to return to being randomly oriented after an MRI scan?	926	ten_mile_river
Are there any health risks associated with breathing pure oxygen for extended periods?	925	walczyk
Does counting "one-one thousand, two-one thousand..." after seeing a flash of lightning until you hear thunder actually give you a good estimate how far away you are from the flash?	925	MikeSupertramp
Reddit, are you ready for my glass challange, I need your help!	924	damnyouglass