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

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Can the rotation of something (for example a helicopter blade) become synced up with the "shutter speed" of the human eye? If so, would it appear stationary as if it were a camera?

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If energy can be neither created nor destroyed, then is there a finite and constant amount of energy in the universe always? If so, do we have any way of calculating it?

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Are there any other organisms that display the feeling of guilt?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Can the rotation of something (for example a helicopter blade) become synced up with the "shutter speed" of the human eye? If so, would it appear stationary as if it were a camera?	1
If energy can be neither created nor destroyed, then is there a finite and constant amount of energy in the universe always? If so, do we have any way of calculating it?	1
Are there any other organisms that display the feeling of guilt?	1