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Children learn language effortlessly and completely voluntarily. They learn new words miraculously fast. A teenager masters about 60,000 words of their mother tongue by the time they finish high ...

In many households, it’s a forbidden four-letter word. It can’t be uttered aloud, only spelled, so those within earshot don’t get too worked up. “Can you take the dog for a W-A-L-K?” Many dog owners ...