This spring, MLB players can challenge ball and strike calls. The camera-based system is only an experiment for now — but it has the baseball world wondering where to draw the line with technology.

A BALL clamp for holding a camera to any suitable support may be made very simply as follows: Two clamp plates should be fashioned out of a 17.i-inch by 5/16-inch stick of wood, one being 4% ...

Much like the challenge system that is already in place both in the MLB and in the NFL, if you win your challenge, you get to keep it. Some people want robot umps in baseball.