Physicists in Germany have discovered that 60 appears to be the minimum number of helium-4 atoms needed for superfluidity to occur in liquid helium. The team obtained evidence for the superfluidity by studying droplets of liquid helium-3 and helium-4. Droplets of pure helium-3 showed no evidence for superfluidity, but the addition of 60 atoms of helium-4 lead to the observation of superfluid behaviour.
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