Know Your Meme

The picture of Bernie Sanders at the inauguration wearing thick, handmade mittens has gone viral. There are now thousands of memes of the photo. Cardboard cutouts of Sanders have appeared at sporting events, and some people have even gotten tattoos of the picture. Why did it become such a hit? Don Caldwell is the editor-in-chief at Know Your Meme, a website dedicated to archiving internet culture. (AP Photo/Ashley Landis)