Just think about this the next time a FedEx van comes speeding past you -- that four-wheeled transporter could be carrying containers equipped with 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 collects it upon delivery of the go
