Alexandre Grothendieck talked a lot about ethics when a member of the group [Survivre et Vivre][1]. He also made a famous speech at CERN , entitled "*allons nous continuer la recherche scientifique*", for which there exists both [audio recordings][2] and [written translations][3]. [1]: http://science-societe.fr/survivre/ [2]: https://www.youtube.com/watch?v=ZW9JpZXwGXc [3]: https://www.cairn.info/revue-ecologie-et-politique-2016-1-page-159.htm