A space crew of 11 female mice, flying on a shoestring budget, will soon teach us more about artificial gravity than NASA has managed to learn in more than 40 years. That’s what Mars Society president Robert Zubrin is saying about the Mars Gravity Biosatellite Project, which will study the long-term health effects of Martian gravity on mammals. “We’re hoping,” said MIT professor Paul Wooster, Biosatellite’s program manager, “to find out if Martian gravity, which is one-third of the Earth’s, is enough to counteract the bone and muscle loss astronauts experience in zero-g.”