A Pearl of Wisdom for all Tech Designers to keep in the back of their minds..........

When NASA first started sending up astronauts, they quickly discovered that ballpoint pens would not work in Zero gravity. To combat this problem, NASA scientists spent a decade and $12 billion developing a pen that writes in zero gravity, upside down, underwater, on almost any surface including glass and at temperatures ranging from below freezing to over 300ºC.
The Russians used a pencil.