You've probably never thought about the universal joint in a vehicle's drive shaft. John Sweetwood has—a lot—and that's how he invented a new version of this critical component.
from nicholemhearn digest http://www.chicagobusiness.com/article/20180308/ISSUE01/180309924/the-aha-moment-that-led-to-this-square-ball?utm_source=ISSUE01&utm_medium=rss&utm_campaign=chicagobusiness
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