> First predicted in 1924 by Einstein and the Indian physicist Satyendra Bose, this whole class of ultra-cold superfluids is now known as Bose-Einstein condensa

> First predicted in 1924 by Einstein and the Indian physicist Satyendra Bose, this whole class of ultra-cold superfluids is now known as Bose-Einstein condensates. No, this whole class of ultra-cold superfluids (referring to fluids similar to superfluid helium) were not "first predicted in 1924", as Mrs. Hosenfelder erroneously writes. It is the Bose-Einstein condensate (BEC) that was predicted in 1924, not superfluids. A Bose–Einstein condensate is a state of matter where dilute gas of weakly interacting bosons of cold enough temperature turns into condensate, a different phase of matter. A superfluid was first discovered in liquid helium in 1937-1938 experimentally by Kapitza and independently by Allen and Misener. Liquid helium is no weakly interacting gas, but nevertheless the explanation of its superfluidity in terms of Bose-Einstein condensate was proposed soon after the discovery. Later on it turned out that superfluid helium is no ordinary BEC, but needs quite a different description (interacting particles in liquid). As Balibar writes, "65 years later, the connection between superfluidity and BEC is still a matter of debate and study" https://www.researchgate.net/publication/1935151_Looking_back_at_superfluid_helium https://www.researchgate.net/publication/1935151_Looking_bac... See also https://www.eng.fsu.edu/~dommelen/quantum/style_a/nt_sfnebec.html https://www.eng.fsu.edu/~dommelen/quantum/style_a/nt_sfnebec... https://www.physicsforums.com/threads/superfluidity-helium-3-and-helium-4.640281/#post-4097603 https://www.physicsforums.com/threads/superfluidity-helium-3... There are also other superfluids that are not BEC, like superfluid helium 3. It is fermionic condensate, not BEC. I remember from my studies of physics that all this was quite a common knowledge in the circles of cold temp physics. I wonder why Mrs. Hossenfelder, a physicist herself, neglects to reflect this basic knowledge in her article. Perhaps she is now more of a pop-sci blogger than a scientist?