Bottom 40% are responsible for maintenance - without them there can be no production (i.e. they're vital). It's not easy to write code or work on 3D printers wh

Bottom 40% are responsible for maintenance - without them there can be no production (i.e. they're vital). It's not easy to write code or work on 3D printers when your toilet is clogged and there are no people unloading trucks at the local stores :-)