For 13 years, astronomers believed themselves to be lucky. They had been studying fast radio bursts (FRBs) from outside our galaxy — and then they became luckier still. On April 28, 2020, two ground-based radio telescopes detected an intense pulse of radio waves within the Milky Way. It was the first time an FRB had ever been detected within our galaxy and, despite only lasting a mere millisecond, it was almost impossible to miss......