ICYMI, Wednesday’s links are here , and include lots of ugly Christmas sweaters (plus instructions for making your own), how McDonald’s got started, why woodpeckers don’t get concussions, how your apps are tracking you (and who they’re sharing the info with), and advice from c. 1200 on 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).