The coffee connoisseurs in the crowd are probably familiar with the popcorn popper method of roasting your own beans. But anyone who’s tried it has probably found the hot-potato method of transferring the roasted beans back and forth between two colanders, to arrest the roasting process, a little… inelegant. On Evil Mad Scientist, Windell shows how he turned an air popper into a cooler for cooling the beans down after they’ve come out of the roaster. And no, unfortunately, the same air popper cannot be used to for both the roasting and the cooling. You need two air poppers.