When NASA first started sending up astronauts, they quickly discovered that ballpoint pens would not work in zero gravity. To combat the problem, NASA scientists spent a decade and $12 million to develop a pen that writes in zero gravity, upside down, underwater, on almost any surface including glass and at temperatures ranging from below freezing to 300C.
The Russians used a pencil.
1st retort: OK, but they have a pencil sharpener that works in space????
2nd retort: If they were velcro-ed to a surface, they could use a grind and crank model... :-)