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

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Only show posts with narrations

How do trees know when to shed their leaves in the fall, and begin re growing them in the spring? How does this process work?

38 upvotes

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Why are there random and seemingly pointless things that give you the sensation of your blood running cold? Like fingers on a chalkboard, or biting down on metal.

9 upvotes

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How does human behavior appear to have changed since the beginning of history as compared to before? Where we in many ways more similar to chimpanzees and bonobos than we are now?

1 upvotes

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Is there any conclusive evidence that using marijuana during pregnancy can cause birth defects?

1 upvotes

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Why does the sound of fingernails on a chalkboard (or other things) give you the feeling of your blood running cold?

1 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
How do trees know when to shed their leaves in the fall, and begin re growing them in the spring? How does this process work?	38
Why are there random and seemingly pointless things that give you the sensation of your blood running cold? Like fingers on a chalkboard, or biting down on metal.	9
How does human behavior appear to have changed since the beginning of history as compared to before? Where we in many ways more similar to chimpanzees and bonobos than we are now?	1
Is there any conclusive evidence that using marijuana during pregnancy can cause birth defects?	1
Why does the sound of fingernails on a chalkboard (or other things) give you the feeling of your blood running cold?	1