Computer code operates behind nearly everything we do - from small calculations in the home to complex executions that drive the global economy. It influences who we see, follow, and like online and describes the websites we visit, the connections between them, the sounds heard on Spotify and videos watched on YouTube. There is very little we do which hasn't, in some way, been codified, analysed, and computed electronically, yet few of us possess a basic understanding of that ultimate language barrier. That's a shame, because coding is the key to so much. Simple programming concepts can explain plenty about the modern world and the changes to come in the age of AI. From algorithms and scripts to block-chain, bits and bots, turn to 30-Second Coding to reveal the secrets behind this fascinating subject.