We start out willing to fail as we learn to walk and talk and swim and ride a bike, but somewhere along the line we come to think that we have to get it right first time, every time, before even starting out.

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The carousel, for example, evolved from machines designed to help princes learn to ride ponies in the 17th and 18th Centuries.

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Learn to ride it, he tells businesses, or you will be crushed and drowned.

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Youngsters aren't allowed to ride until they first learn how to groom the animals, clean their hooves, saddle and bridle them and, yes, muck their stalls.

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