Riddle Me This: Fans and Ping Pong
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?
The Baldwin Hills Dam Disaster
Engineers: Understand the critical role of geological analysis in dam design from the Baldwin Hills disaster. Gain valuable insights.
Knock Out All Your PDH in One Shot!
Knock out all your PDH requirements at once with Professional Development Seminars. PDS provides multi-day seminar sessions that are designed to help PEs complete their requirements at once in the comfort of their home or office.
The August Ethical Dilemma: Public Service
Engineers: Explore this ethics case study on serving as city engineer & working for private developers. Is there a conflict? Discuss now!
August 2025 Pop Quiz for Engineers
Escape the summer heat and challenge your engineering mind. Take the quiz and prove you're hotter than the summer sun.
Riddle Me This: Cylindrical Draining
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?