&gt; <i>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.</i><p>No, this whole class of ultra-cold superfluids (referring to fluids similar to superfluid helium) were not &quot;first predicted in 1924&quot;, as Mrs. Hosenfelder erroneously writes.<p>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.<p>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,<p><i>&quot;65 years later, the connection between superfluidity and BEC is still a matter of debate and study&quot;</i><p><a href="https:&#x2F;&#x2F;www.researchgate.net&#x2F;publication&#x2F;1935151_Looking_back_at_superfluid_helium" rel="nofollow">https:&#x2F;&#x2F;www.researchgate.net&#x2F;publication&#x2F;1935151_Looking_bac...</a><p>See also
<a href="https:&#x2F;&#x2F;www.eng.fsu.edu&#x2F;~dommelen&#x2F;quantum&#x2F;style_a&#x2F;nt_sfnebec.html" rel="nofollow">https:&#x2F;&#x2F;www.eng.fsu.edu&#x2F;~dommelen&#x2F;quantum&#x2F;style_a&#x2F;nt_sfnebec...</a><p><a href="https:&#x2F;&#x2F;www.physicsforums.com&#x2F;threads&#x2F;superfluidity-helium-3-and-helium-4.640281&#x2F;#post-4097603" rel="nofollow">https:&#x2F;&#x2F;www.physicsforums.com&#x2F;threads&#x2F;superfluidity-helium-3...</a><p>There are also other superfluids that are not BEC, like superfluid helium 3. It is fermionic condensate, not BEC.<p>I remember from my studies of physics that all this was quite a common knowledge in the circles of cold temp physics.<p>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?