30-Second Twentieth Century: The 50 most significant ideas and events, each explained in half a minute

You probably know, or think you know, quite a bit about what happened in the 20th century – chances are, if you're reading this, you lived through at least some of it – and you may have referenced the Cuban Missile Crisis, the double helix, or the Wall Street Crash in conversation. But even for people who were there, it was the fastest-moving hundred years in history, so refresh your memory with these pacey profiles on everything from Sputnik to Stonewall.
Twentieth Century presents a uniqu...