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Many years ago, lumberjacks loved to sit around blazing campfires and tell whoppers, or tall tales. Their favorite tales were stories about the superlumberjack, Paul Bunyan, and his great blue ox,…
Scaly dinosaurs and flying reptiles disappeared from the earth about sixty-five million years ago—long before there were people. Yet there are pictures of these animals in books. How do we know…
My heart is about as big as my fist. Each side of it works. The right side receives blood from the rest of my body. It pumps the blood to my lungs. In my lungs, blood takes oxygen from the air. The…
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