A large fan is mounted to the ceiling of a factory. It’s turned off and perfectly still. An engineer climbs up and places a ping pong ball on top of one of the blades. Then she turns on the fan remotely. The ball does not fall. Why not?

Escape the summer heat and challenge your engineering mind. Take the quiz and prove you're hotter than the summer sun.

A cylindrical tank with a hole at the bottom drains in exactly 60 minutes when full. How long will it take to drain if it's initially only half full?

Celebrate American ingenuity and your engineering skills. Take this month's quiz and declare your independence from ignorance.

A 1-ton truck must cross a bridge that can hold no more than 1 ton. The truck is empty but barely weighs 1 ton. As it’s halfway across the bridge, a bird weighing 20 grams lands on it. Will the bridge collapse?

A Father's Day Tribute, Engineered! Show Dad you're the future of engineering by acing this month's quiz. Take the challenge and make him proud.