Throwing two-seam and four-seam fastballs, he reached 92 to 94 mph on the radar gun as reporters and fans watched. "For a first day, that’s great," Dodgers manager Dave Roberts said afterward.

In 1989, at the International Players Championships in Miami, the sport debuted a device that didn’t call the serves, but timed them—a radar gun. Serve speeds like Tilden’s had been measured ...

William Fox and John Vesecky have discovered that with a little tweaking, a run-of-the-mill radar gun can become an instrument for detecting suicide bombers. The duo found that at a specific ...