liquid nitrogen cooling that keeps its innards at a chilly -150 degrees Celsius. Don't worry, though, says FedEx, the use of dry vapor is actually safer than the currently used dry ice and classifies this new methodology as non-hazardous. While we may like to poke fun, it sounds like a pretty legitimate boon for healthcare and biotechnology shipments, which can now be maintained at a deeply frozen temperature for up to 10 days at a time. FedEx will provide the self-sufficient container and collect it upon delivery of the goods, while also monitoring its condition during transit. No word on whether or when DiGiorno will be signing up for the service.