Scientists have now levitated mice using magnetic fields.
Other researchers have made live frogs and grasshoppers float in mid-air before, but such research with mice, being closer biologically to humans, could help in studies to counteract bone loss due to reduced gravity over long spans of time, as might be expected in deep space missions or on the surfaces of other planets.
Scientists working on behalf of built a device to simulate variable levels of gravity. It consists of a that generates a field powerful enough to levitate the water inside living animals, with a space inside warm enough at and large enough at 2.6 inches wide (6.6 cm) for tiny creatures to float comfortably in during experiments.
--Charles Q. Choi, LiveScience, on getting picked up from the inside