In 1978, Sally Ride, a PhD candidate at Standford University, responded to a newspaper ad to join the US astronaut program. She was accepted and became the first American woman astronaut to fly in space! Among her other accomplishments, she played tennis like a professional, was an astrophysicist who helped develop a robotic arm for space shuttles, and later, through Sally Ride Science, worked to make science cool and accessible for girls. Sally Ride,...