It's not every day that disputes over particle physics leads to assault charges.
Keller was accused of attacking Stephan Fava while Fava and his friend were discussing physics in the Bay Area town.
The charges didn't stick, however, as Keller has been acquitted by a San Mateo County jury.
The verdict is still out string theory, however, so there's no indication that physics-related violence will abate any time soon.
Photo by Steve Jurvetson.