When NASA began the launch of astronauts into space, they found out that the pens wouldn't work at zero gravity (Ink won't flow down to the writing surface).
In order to solve this problem, it took them one decade and $12 million. They developed a pen that worked at zero gravity, upside down, underwater, in practically any surface including crystal and in a temperature range from below freezing to over 300 degrees C.
And what did Russians do.............................??
The Russians used a Pencil!!!
Moral of the story: KISS (Keep It Simple,Stupid) i.e. always look for simple solutions. Devise the simplest possible solution that solves the problem.