Dr. Peggy Whitson, the first woman to command the ISS, might soon also hold the record for the most spacewalks by a female astronaut. She's scheduled to step out of the ISS today (March 30th), and once she does, she'll have eclipsed the number of times current record holder Sunita Williams floated around in space outside the orbiting lab. Williams still holds the distinction of being the astronaut who fixed the ISS with a toothbrush, though.