Broken bones can be a real disaster. For example, a broken hip usually requires a surgery. It will be great to develop a nanomaterial that quickly solidifies at body temperature into a bone-like substance and speeds the recovery. By the way, the material can be made to match the mechanical properties of the tissue it is injected into so as to be used while wounds, burns, etc. treating.

I suppose that microscopic worms could do a better job of detecting explosives than X-ray machines, metal detectors or bomb sniffing dogs. The tiny nematodes, known as Caenorhabditis elegans, have little scent organs on the sides of their mouths. Why not extract the receptors from the amphids and incorporate them into a device (so called bomb sniffing machine).