Unique program at HHS has students repairing bikes, which are then donated back into the community

The air smells like WD-40. The carpet is covered with a big blue tarp. The sound of instruction is intermittently interrupted by an air compressor. And the pressure is on. Class will be over in 10 minutes. How much more productivity can be squeezed out of the final few minutes before the tools have to be put away? How many more bikes can be fixed?