Um lápis

"I heard this urban myth a long time ago and it 
stayed with me. When NASA first 
started sending astronauts into space, they quickly discovered that ballpoint pens wouldn’t work in zero gravity. To combat the problem, NASA scientists spent a decade and $12 billion developing a pen that writes in zero gravity, upside down, underwater, on any surface and at temperatures ranging from below freezing to 300°C. The Russians used a pencil."

Think Quaterly