SoT 166: That's No Moon

Defence giant Lockheed Martin has announced it wants to build a truck-sized nuclear fusion power-plant in the next ten years. They just don't appear to have a plan.The microbes in our guts have their own body clocks, and they too get messed up when we get jetlagged.The giant kangaroos that used to roam the Australian continent were three times the size of their modern descendants. And new research shows they used to walk, rather than hop.NASA's Messenger spacecraft has provided the first optical images of ice on the planet Mercury.Mimas, one of the smaller moons of Saturn, may have an ocean of liquid water beneath its surface, after pictures taken by Cassini show an extra wobble in its rotation.