Frank Chimero in his post, Elegance, Lightness, and Nothing:
There’s an old story that people like telling, untrue as it may be, about writing implements in space. The American space program discovered that normal ink pens didn’t work on missions (no gravity in orbit to pull down the ink), so they spent millions to research and develop a pen that could write upside down. The Russians, the story goes, brought a pack of pencils.
Love that story.