Add Yahoo as a preferred source to see more of our stories on Google. The annual Soap Box Derby is back, bringing food, music and competition to Magnolia Street. This marks the 16th year of the event.

Gravity is an inescapable force. It gives us our atmosphere and our orbit, and it can bring us to our knees. It also makes possible the Soap Box Derby. This gravity-powered American tradition is ...

Gravity is an inescapable force. It's why Earth has its atmosphere and orbits the sun. It can bring us to our knees. And it makes the race known as the soap box derby possible. This gravity-powered ...

At Portland's annual soapbox derby, motorless cars race downhill pulled by nothing more than gravity. It's part race, part parade, with cars built to look like sharks, guitars and slices of cake.