N'okpuru 2.17 K mmiri 4He na-aghọ superfluid (Nobel Prize 1978, Pyotr Kapitsa) ma na-egosi njirimara njirimara dịka ọkụ ọkụ site na ụda nke abụọ, viscosity efu na nsonaazụ iyi n'etiti ndị ọzọ. Ajụjụ: Mgbe Heike Kamerlingh meriri Nobel Prize?
Afọ 1913