According to NanoWerk, UC Riverside researchers have come up with a memory device based on telescoping multi-walled carbon nanotubes. According to one of the researchers, "This finding leads to a promising potential to build ultrafast high-density nonvolatile memory, up to 100 gigahertz or into the terahertz range" and a prototype could be demonstrated "in the next two to three years." Similar devices from UCLA and Caltech based on bistable rotaxanes are farther along in being integrated into actual memory circuits, but tend to break after a fairly small number of position changes. Carbon nanotubes may promise more durable switches.
The FDA has just approved for military use a shunt which allows partially-severed limbs to continue to get circulation. According to the article, "For most, it won't be a matter of saving a limb outright but rather salvaging the quality of a wounded leg or arm." This is because "The tubelike device is designed to connect the two ends of a severed blood vessel, providing a temporary bridge or shunt around a wound to restore blood flow to an injured limb" according to the FDA. "The shunt may save injured limbs from amputation, since it can be implanted on the battlefield to maintain blood flow until a wounded soldier undergoes surgery, FDA officials said. Since the start of the Iraq war, more than 500 soldiers have lost limbs, many to injuries suffered in roadside bombings."
A rolling disk gathers no MOS.