In fairness, powdered graphite (a conductor) from pencil lead doesn’t mix well with microswitches and other sensitive electrical devices, and can also get into the eyes of the astronauts.
43 posted on 05/30/2018 7:35:42 AM PDT by Little Pig
53 posted on 05/30/2018 7:51:25 AM PDT by null and void
(Urban "food deserts," are caused by "climate change" in urban customers' attitudes (H/T niteowl77))