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.

Soap box derbies send motorless cars down a steep incline. At one event, contestants make their cars look like cartoon characters, subway cars, food, and giant animals (among other outlandish shapes).

DES MOINES, Iowa — Summer can be a challenging time for parents to navigate activities and mental health for their children.