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I have muscles where?: Sid's dad told him a funny joke and he laughed so hard that his face began to hurt -- Sid's amazing lungs: Sid runs around frantically trying to get ready for school -- How did my dog do that?: Sid sees his dog Philbert scratching his ear with his hind leg and tries to do it himself -- Now that's using your brain: The brain controls all kinds of things in your body including walking, thinking and getting ready for school.
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