A San Mateo man is currently on trial for allegedly putting a beatdown on another homeless man. Why? Well, according to SFGate, Jason Everett Keller, 40, reportedly attacked fellow happy-wanderer Stephan Fava in South San Francisco this past March. It seems that Fava "was chatting with an acquaintance, who is also homeless, about 'quantum physics and the splitting of atoms' [when] Keller joined in the conversation and, for reasons unknown, got upset." The report goes on to say that Keller, presumably demonstrating how atomic and subatomic systems can be created or whatever, "picked up his skateboard and hit Fava in the face with it, splitting his lip." Keller is expected to take the stand soon, testimony that we very much look forward to hearing.