


What was the most important thing ever invented? It was—language! With language, people can explain ideas and trade thoughts. Communication— being able to share information—is what made…

My hands and feet are important parts of me that I can see. I use them to do all kinds of work. My fingers and thumbs pick up things and hold them. When I try to pick up things without using my…

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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