| The technical term for snapping your fingers is “fillip.” |
| The ridges on the sides of coins are called reeding or milling. |
| Humans are the only creatures that can blush. |
| Insects shiver when they cold. |
| Ants don’t sleep. |
| Cat’s urine glows under a black light. |
| When hippos are upset, their sweat turns red. |
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