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Can you cry underwater?
Why does a round pizza come in a square box?

Explanation:

1. you can't really open your mouth to breathe. When you cry, tears fall from your eyes and run down your face; when you're underwater and try doing this, it won't work out this way

2. a round pizza means that the dough stops in the corners and cannot slide all over the place. Having a square box for a round pizza is a good idea for helping to get the pizza to its destination in one piece

convex lenses are thicker at the middle. rays of light that pass through the lens are brought closer together (they converge). a convex lens is a converging lens. when parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus.

this means that the temperature of both substances will be equal