From doescience https://twitter.com/doescience on Twitter: No human-made collider could create a neutrino with enough energy to test a theory from 1960. But supermassive black holes could. That's a likely source of a neutrino that hit @uw_icecube & was observed by @penn_state researchers and other partners: https://news.psu.edu/story/648321/2021/03/10/research/icecube-spots-first-ultra-high-energy-antineutrino-directly https://twitter.com/doescience/status/1392516176832573453/photo/1 https://chirp.cooleysekula.net/attachment/71981