Glass is made of sand, which is a kind of rock. But glass is transparent. We explore why! Glass is made of sand, which is a kind of rock. But glass is transparent, and rocks aren’t transparent. What’s ...
(via It's Okay to Be Smart) Glass is made of sand, which is a kind of rock. But glass is transparent, and rocks aren’t transparent. What’s up with that? Why is glass clear? And why can I sit on a ...
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