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Do you know the story of the most expensive mistake in history?

Here's a brief recap...

In 1962, NASA launched the Mariner I rocket into space. It exploded less than five minutes after liftoff.

The cause? A missing hyphen in the mathematical code.

Guess how much that missing hyphen cost the government? An estimated $80 million -- or nearly $650 million in today's money.

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Proofing it Write

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