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One morning, a light bulb in a ceiling fixture at Mr. Wu's
Chinese restaurant burned out. Mr. Wu climbed up on a stepladder
to change the bulb. As he was standing on the ladder, his
watch fell out of his pocket. It went right into a large bowl
of tea! But when Mr. Wu climbed down and took his watch out
of the tea, it wasn't the least bit wet. Why not?
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