This is the slowest radioactive decay ever spotted
It takes 1 trillion times the age of the universe for a xenon-124 sample to shrink by half
![two-neutrino double electron capture](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2019/04/042319_MT_half-life_feat.jpg?fit=860%2C460&ssl=1)
STRANGE DECAY In a first, scientists have directly detected an extremely rare type of radioactive decay called two-neutrino double electron capture.
XENON Collaboration