What were you doing when you were 15 years old? Maybe getting your driver’s permit? Or finding the guts to ask out that crush of yours? Or thinking about a way to build a giant ping pong-ball machine ...

The warning at the end of this clip, by Purdue University professor Mark French, is "Do not try this at home." Yeah, right. French and his ME students are demonstrating a de Laval nozzle using a Ping ...

[Andrew] and his brother had some time (and a lot of ping pong balls) on their hands, so they decided to have some fun and built a remote-controlled ping pong ball turret. Arduino aside, the turret is ...