My brain is busy taking care of me even when I don’t think about it. My lungs breathe in fresh air and breathe out used air. My heart pumps blood through my body. My stomach and intestines digest my…
> mercury ore (cinnabar) and mercury Imagine a dry liquid—a liquid you can stick your finger into without getting it wet. There is such a liquid. It’s a melted metal that stays melted even when…
If you think of four as four dots, you can show the dots as a square. And that’s how the ancient Greeks thought of four—as a shape with four sides and four corners. Four is an even number. It can…
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