Glass is a puzzle. This is enough to protect us, but it shatters incredibly easily. It is made from opaque sand, but it is completely transparent. And, after all, it acts like a solid substance … but it’s a kind of weird liquid in disguise! You can find glass everywhere you look: Most rooms in your home will have a glass window, otherwise, a glass mirror … or a glass lamp. Glass is one of the oldest and most versatile man-made materials in the world.
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