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How Do Eyeglasses or Contact Lenses Correct Our Vision?
How Do Eyeglasses or Contact Lenses Correct Our Vision? If your eyes did not do their job, your eyesight would be fuzzy and blurred.…
Which Is the World’s Largest Lake?
Which Is the World’s Largest Lake? Imagine a lake almost as big as the entire state of California. That's the size of the Caspian…
Do All Other Creatures Use Tools?
Do All Other Creatures Use Tools? Man was not the first of the creatures on earth to use a tool. Tools are used by…
What Is Clay?
Clay is a special kind of earth. It is made up of the smallest particles of rock, tinier than those in most other kinds…
What Makes a Bell Ring?
What Makes a Bell Ring? A bell is like a metal cup with a clapper hanging inside. When the clapper strikes the bell, the…