Mark Rober had a problem. Squirrels, those jerks, kept stealing his bird seed. His solution? Building an incredibly intricate squirrel-proof bird feeder, which he created using mechanical engineering.

You might call that seed-filled object in your yard a bird feeder, but to a squirrel, it's a squirrel feeder, especially if squirrels can reach it without too much trouble. And "too much trouble" ...