Most scientists think that the first tiny sea plants made it possible for life to come onto the land. To live, plants and animals must take in a gas called oxygen. The tiny sea plants and animals of…
The abacus was the “great grandparent” of many other kinds of counting machines, such as the adding machine, the cash register, the computer, and the electronic calculator. It’s easy to see where we…
Do you know “Old MacDonald Had a Farm”? Or “The Frog Went A’Courting”? Or “Yankee Doodle”? These are folk songs. Foik songs are songs that are made up by common people. Many folk songs tell about…
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