From whence came you, stranger?

It is curious to realize that wet sand will keep footprints in it, while dry sand won’t. I wonder whether it is as simple as a question of friction. Then, of course, why would wet sand be of more friction than dry sand?

Weird. But since this is physics, there’s probably an answer to it in the end that I will feel like I should have known all along.

© 2019 Alexander Biebricher All Rights Reserved.
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