The Chicago River Lock

The Chicago River runs backward.  It used to go into Lake Michigan, but using a lock, the flow was reversed! The flow was changed because the dirty river was dirtying the city’s clean drinking water. The Chicago Harbor Lock is important to the people in Chicago. A lock helps boats…

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The First Airplane

The First Airplane The Wright brothers, who were named Orville (1874-1929 in Ohio) and Wilbur (1867 in Indiana to 1912 in Ohio), invented the first airplane. Before they tried flying, they built bicycles and unique kites. The brothers began testing gliders for people in 1900. They successfully flew for the…

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How a Light Switch Works

When you flip a switch, you close the circuit so now the circuit looks like this: Closing the circuit, you connect the wire with the rest of the circuit! But why couldn’t you turn on the light before? Before the circuit looked like this:Looking at this diagram, we can see that not…

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