In Once Upon a Time I Lived on Mars, Kate Greene talks about Shannon Lucid, the NASA astronaut who spent six months living on the Russian space station Mir. Shannon, it turns out, was a bookworm. During her stay, she read 50 books and improvised shelving from old food boxes, complete with straps to stop the books floating off. This was in 1996, a good decade before the invention of the Kindle, and so these were real books. She apparently chose titles with the highest word to mass ratio, since launch weight is a critical factor! Lucid left her library behind for future spacefarers, but it burned up when Mir was de-orbited in 2001.