Mark Rober: I make sure kids see when my experiments fail. They should know successful people don't always get it right.

Mark Rober is the latest YouTube star to get a Netflix deal. Kimberly White/Getty Images for Rivian YouTuber and former NASA engineer Mark Rober creates toys that inspire curiosity. His 19-year-old, who has autism, has redefined success for him, he says. He says video games taught him about embracing failure and trying again. This as-told-to essay is based on a...