Can you build a single-axle, two-wheel chariot for our Sphero robots to pull? Join us at the downtown library (610 Quincy Street, upstairs) and put your building skills to the test by navigating your chariot over inclines, bridges, difficult terrain and more! You can sign up for one of three, one-hour sessions Tuesday, June 12 between 1 and 4 p.m. with a limit of 8 participants per session.