Happy Critical Mass Friday, y'all. Here's some happy bike-related news for you: The San Francisco Unified School District is encouraging students to cycle to school. SFUSD and the San Francisco Bicycle Coalition have recently installed new bike racks at Francisco Middle School and teamed up to teach students basic street safety, bike courtesy, and how to blow the perfect snot rocket. According to Leah Shahum of the Bicycle Coalition, "This is really about working regular exercise into your everyday lifestyle so [that] when kids grow up they are living healthy active lives." And while the paranoid, hysterical mother in us wants to take little Cody to school in a monstrous but protective Hummer, the rational cool older brother in us thinks this is a great idea. Kudos, SF Bike Coalition and SFUSD.