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Jul
16
comment Why is water clear?
Just want to mention that while snow isn't "transparent", it does let a -lot- of light through, which is part of the reason that grass will die if you leave a tarp on it, but can survive the winter with a layer of snow on it the whole time.
Apr
8
comment A mirror flips left and right, but not up and down
I created/associated my account just to say that the first part of your explanation example (mirror on the ceiling) really clarifies well, you should post it as an answer! The second part is a little more unclear, actually.