Sometimes progress takes the form of not getting killed with a poleaxe. Via HN.

The population of London in the 14th century likely ranged between 40,000 and 100,000 people. In a city of 80,000, the medieval London murder rate would be 15 to 20 times higher than an English town of comparable size today…
Jennifer Ouellette at Ars Technica – Lose yourself in this highly addictive “murder map” of medieval London