Discover how Earth’s intricate climate system is changing. Don't miss "Decoding the Weather Machine," premiering April 18 at 8/7c on PBS: http://to.pbs.org/2uwEuLF | NOVA l PBS

Laser coding machine prints QR code #codingmachine | Henan Cyril Machinery Equipment Co.,LTD

"To break the code, you could try each different setting of the Enigma machine one after the other, but it would take you around five trillion years..." Find out how the German Enigma machine really worked. And how British codebreakers at Bletchley Park were able to finally crack it during the Second World War. Watch Uncovering the Enigma: Bletchley Park on History Hit TV: https://access.historyhit.com/videos/uncovering-the-enigma-bletchley-park | History Hit