Electric scooter injuries rose 222 percent in 4 years in the U.S.

Electric scooters are clogging up big city sidewalks and jamming up hospital rooms, too.

Using U.S. emergency room reports of e-scooter injuries, scientists estimate there were 19 injuries per 100,000 people in 2018, compared with just 6 injuries per 100,000 in 2014.