What do engineers do when they get bored with designing parts for the Curiosity Mars rover? They put their engineering skills to work and build the most sophisticated obstacle course for squirrels.

The squirrel ninjas triumph again. Mark Rober may be a former NASA and Apple engineer but the squirrels in his backyard are smarter than his obstacle course. After version 1.0 of the squirrel maze ...

[Mark Rober] has a bird feeder in his back yard. Also, squirrels who eat the seed. So, as one does, he built a nine part squirrel obstacle course with a reward of walnuts at the end, and filmed them ...