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Answer: to clear the way for a new rail line
Explanation:
In 1848, a 25-year-old railroad worker named Phineas Gage was blowing up rocks to clear the way for a new rail line in Cavendish, Vt. He would drill a hole, place an explosive charge, then pack in sand using a 13-pound metal bar known as a tamping iron. But in this instance, the metal bar created a spark that touched off the charge.
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