From lbaudis https://twitter.com/lbaudis on Twitter: For the first time, we observed the two-neutrino double electron capture process in 124-Xe with @Xenon1T data, with an incredibly long half-life of 1.8 x 10^22 years. This half-life is many orders of magnitude larger than the age of our Universe, which is about 1.4 x 10^10 years. https://twitter.com/lbaudis/status/1121098153216835584/photo/1 https://chirp.cooleysekula.net/attachment/57142