imageMesa Verde Middle School students Philip Boudrias, left, and teammate Eric Harmatz prepare their trebuchet for firing during the Storm the Castle event at Saturday’s Regional Science Olympiad.

Evan Kaiser, a junior at Lake-Lehman High School, mimics taking a nap while waiting for sand to fill a bucket hanging from a model bridge he designed and built. Before taking his turn testing his ...

Alex Kaplan, a student at Lake Braddock Middle School, needed to know whether his design should be classified as a wheel or a Class Three lever. “It’s spinning on an axle,” he explained to Tim Harazin ...