How cold can it get?

Cryogenics is the science of cold. But how cold is cold? In this video, Fermilab scientist Dr. Don Lincoln tells us about some of the most amazing achievements in cryogenic science. And there is no truth to the rumor that he sings at the end. Fermilab physics 101: https://www.fnal.gov/pub/science/part... Fermilab home page: https://fnal.gov