Why can you see through H2O as both a liquid and a solid but you cannot see through something like Au (gold) in a solid state? Is this a matter of density?
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I read comments on a similar question as this. And it boiled down to our eyes evolved to be able to see through water since it was advantageous to do so. We evolved from sea creatures so seeing in water was a huge benefit. Think about bees. I believe certain bees, if not all, can see in ultraviolet. It is an evolutionary advantage.
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