Stop the raindrops from getting into the house! Eager engineers learn about roofing history and waterproofing by nanotechnology. They get into groups and work on designing a waterproof roof for a small model house. The accompanying...

It's all downhill from here. Scholars model a sewer system using straws and other household materials. They test out their systems using colored water and discover how gravity plays an essential role in sewers.

Gum be gone! Scholars conduct an experiment to find the best substance that would help remove gum from the bottom of a shoe. They test peanut butter, petroleum jelly, olive oil, vinegar, and rubbing alcohol in their experiments.

Here's an electric lesson on electricity. Pupils create an electric circuit to model a city's electric system. They then test out different materials to see whether they are conductors of electricity.

Hear about a great resource on sound? An interesting hands-on activity has learners construct a device that will soundproof a phone or speaker. They test out different materials to see which ones best absorb sound waves.

Watch those balloon cars go! Scholars build racers that run using the power of balloons and conduct races with the cars. They learn about Newton's third law of motion and how it applies to their balloon racers.

Students' understanding of how robotic ultrasonic sensors work is reinforced in a design challenge involving LEGO MINDSTORMS NXT robots and ultrasonic sensors.