Well, here it is: a shoe-in for the new world’s largest NERF gun. (Video, embedded below ... which belongs to former NASA mechanical engineer Mark Rober and his now-puny six-foot six-shooter.

Well, here it is: a shoe-in for the new world’s largest NERF gun. (Video, embedded below ... which belongs to former NASA mechanical engineer Mark Rober and his now-puny six-foot six-shooter.

A NASA engineer-turned YouTuber designed a Nerf gun that launches giant darts at speeds up to 40 mph. Don't tell your older brother. Mark Rober, who formerly worked on the Mars Curiosity Rover as ...