Correction to: Nature Physics https://doi.org/10.1038/s41567-021-01276-2, published online 9 June 2021.
In the version of this News & Views article originally published online, in ref. 1, the URL was missing the text ‘10.1038/’ and should have read ‘https://doi.org/10.1038/s41586-021-03537-9’. All versions of the article have been amended.
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Stringari, S. Publisher Correction: Ultracold gases: Second sound seen. Nat. Phys. 17, 867 (2021). https://doi.org/10.1038/s41567-021-01297-x