Frogbot is a prototype of a small hopping robot that moves by rolls and hops. It could someday help explore Mars. No matter how it lands, Frogbot can right itself quickly by flipping first onto its back, then raising itself up with the help of a flap that is also a solar array. The robot, which weighs less than 3 pounds, can hop 8 feet on Earth. On Mars, where gravity is about one-third that of Earth, Frogbot could clear 24 feet!