As any 9-year-old with a Lego set can tell you, it's easy to build things for destruction. The challenge for grown-ups designing crash-test dummies is to create something highly technical that can recover from one collision to be used in the next. "We don't break bones," says Steve Moss, technical director of First Technology Safety Systems, which is
just starting production of the World Side Impact Dummy, or WorldSID. "Everything is required to deform the way a human would, without breaking like a human does."