This is a re-post from The New York Times.
APRIL 17, 2015
LIKE many inventors, Bob Nepper, 82, is a compulsive improver. Mr. Nepper, an electrical engineer who lives in North St. Paul, Minn., has pet projects that have included a self-guided lawn mower and an outside faucet that can run hot and cold. His basement is stocked with tools like a lathe and a milling machine to craft his ideas.
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