In this episode of Show & Tell, Atlas Obscura staff writer Jessica Leigh Hester talks with Jobbe Wijnen, a “pull-tab archaeologist” based out of the Netherlands. Pull tabs are those small metal things that open cans of beer and soda! Wijnen has amassed more than 3,000 of them, a collection he is continually working to categorize. He has even opened up his work to citizen scientists, so the next time you see a pull tab wedged in the dirt, consider sending it to him.