A guest post from Jack Copeland:
If the ultra-secret logic machine they called Colossus shortened the Second World War by 6 months—and it was probably more—then 3 or 4 million lives were saved.
Read about Colossus in “The Computer That Helped Win World War II”, an open access article in this month’s issue of Spectrum:
https://spectrum.ieee.org/colossus-computer-ieee-milestone
Jack Copeland