"Unix at 50: How the OS that powered smartphones started from failure": https://arstechnica.com/gadgets/2019/08/unix-at-50-it-starts-with-a-mainframe-a-gator-and-three-dedicated-researchers/
Trivia: Did you know that, until 1973, #Unix reset the Epoch every year? The first epoch was 1971-01-01, the second 1972-01-01, & the third 1973-01-01, & time from all three were measured as 60th of a second, guaranteeing an overflow every 2 years. https://stackoverflow.com/questions/11573024/when-was-unix-epoch-time-revised-from-1971-to-current-1970-value