Nearly a century ago, Nantucket residents imported two female deer to keep its solo male company. But the plan came back to bite them. The deer population exploded, and so did that of the ticks. Now, Lyme disease is rampant on the island. The illness has afflicted 15% of residents. “We have a problem with tick-borne disease because we engineered the environment to maximize the number of ticks and maximize the number of mice that are the best hosts of Lyme disease. And it came back and bit us, literally,” says biologist Kevin Esvelt. #deer #lymedisease #60minutes