A first-of-its-kind dark ride coming to Legoland California in 2016 will let riders use karate-chop hand gestures to shoot fireballs at ninja warriors on giant video screens.

A first-of-its-kind interactive dark ride at Legoland California that let riders use karate-chop hand gestures to shoot fireballs at ninja warriors combines kinetic video-game action with an ...

But a black belt like McNair could chop at 46 feet per second. Hitting a piece of wood at that speed, a 11/2-pound hand can deliver a wallop of up to 2,800 newtons (one newton is roughly equal to the ...