This insane chart shows how violence has spiked -- and declined -- since 1400

The good news is: we're killing each other less.  The bad news is: we've been killing each other in armed conflict for a long, long time.  You can see those trends in this new graph from Oxford economist Max Roser: The chart, which recently made it to the front of the Data is Beautiful subreddit, comes with a few takeaways:  • The first half of the 20th century was rough. During World War I, about 90 per 100,000 people died in battle. In World War II, that number spiked to 200 people for...