Lots of ugly Christmas sweaters, instructions for making your own, plus ugly Christmas sweater suits. Related, here’s how to make Ugly Sweater Ornaments.Your Apps Know Where You Were Last Night, and They’re Not Keeping It Secret.The Story of How McDonald’s First Got Its Start.Advice from c. 1200: How to Survive the Winter. Don’t forget to lay off the purging and blood-letting, and keep your hands and feet covered in wolf grease.The lost art of flower-making.ICYMI, Friday’s links are here, and include using fake “master” fingerprints to unlock smartphones, the anniversary of Pearl Harbor, an interactive map showing all the ways medieval London could kill you, and T’was the Overnight Before Christmas: The Merry Tale of How Air Cargo Deregulation Led To Amazon.