Happy hackers at Maker Faire 2011

SAN MATEO, Calif.--From the size of the crowd at Maker Faire today, it's clear the world has a growing appetite for DIY innovation. More than 100,000 people were expected for the sixth annual event, taking place at the San Mateo County Event Center this weekend.

A diverse mix of science, engineering, design, and art--with everything from robots to knitting to exploding soda to steam rollers--Maker Faire is an otherworldly extravaganza that attracts kids and adults, leaving both wide-eyed at the marvelous maker creations.

Where else can you see four very realistic beeping R2D2s twirling around through gawking crowds?