Where does the loud, sharp sound of a trumpet come from? It all starts with a tiny \”buzz”—a vibration very much like the one you make when you hum. When you play a trumpet, your lips buzz against…
> Have you ever wondered how people measure the height of a mountain? > They don’t do it by climbing the mountain and measuring with a ruler > as they go! The height of a mountain is found by…
The birds of today sing or whistle or screech. But the first birds may have hissed like snakes! They were more like reptiles than like birds. They were reptiles with wings and feathers. The first…
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