1972
Atomic  


A new superfluid form of helium is found.

Working at a sample temperature barely above absolute zero, the American physicists Douglas Osheroff, Robert Richardson, & David Lee show that the isotope helium-3 becomes a superfluid, a liquid that flows without internal friction. Superconductivity (discovered in 1911), superfluidity (1938) and laser action (1952) are examples of quantum behavior directly observable on the human scale.
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