This is a fun video of a liquid nitrogen demonstration to the public during the 2010 Jefferson Lab Open House.
Unfortunately, how many National Labs can do these Open Houses again? With the austerity measures being in place, and with the budget constraints, cutbacks, and uncertainty, such spending to educate the public and familiarize themselves with the National labs are gone. Open Houses at these labs are "luxuries" that they can no longer afford to do. And that's sad, because it is during such times that the public needs to know the important functions that these labs do, and why they deserve public support.