/u/Samdi's posts in /r/askscience

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Only show posts with narrations

Is the Japanese surgical/dust mask trend actually helping lower the % of people getting sick over there?

7744 upvotes

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Why is it that when you film opposing mirrors' reflection of each other, it sort if looks like light decays with each reflection? Picture inside.

98 upvotes

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I've heard in a recent post that water is at its densest at 4 degrees celsius. How does this play in the largest bodies of water? (Lakes, oceans, etc...)

3 upvotes

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Why do human beings need pillows? Has it always been this way? And what about teeth cleaning?

1 upvotes

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Howcome I can always sense rain coming maybe 15 to 30 minutes ahead of time, even when there isn't any of that "particular wind" going on?

1 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Is the Japanese surgical/dust mask trend actually helping lower the % of people getting sick over there?	7744
Why is it that when you film opposing mirrors' reflection of each other, it sort if looks like light decays with each reflection? Picture inside.	98
I've heard in a recent post that water is at its densest at 4 degrees celsius. How does this play in the largest bodies of water? (Lakes, oceans, etc...)	3
Why do human beings need pillows? Has it always been this way? And what about teeth cleaning?	1
Howcome I can always sense rain coming maybe 15 to 30 minutes ahead of time, even when there isn't any of that "particular wind" going on?	1