Students as young as fourth graders will be competing in the annual Sonoma County Robotics Challenge, which is being held in Santa Rosa tomorrow. The machines are built from Lego kits, but they’re designed to do some fairly sophisticated things. Here’s a preview.

The robotics competition is open to the public, held at Elsie Allen High school, starting at 8:45 Saturday morning. Pictures on this page are from last year's competition.