This ping pong robot can be programmed to be the perfect partner

But for a collaborative sport like ping pong, it's not always easy to find the perfect partner. Brothers, Alexander and Harrison Chen, solved this problem by building the "Trainerbot." This ping pong robot works in tandem with a smart phone app and allows users to create their own custom shots by choosing the speed, direction, and spin with which the Trainerbot shoots balls. Alexander and Harrison say they got the idea after they both moved away from home and lost their playing partner. Every summer and winter break, the two brothers would team up to create prototypes until they came up with the 1.2 kilogram, 16 by 32 centimeter Trainerbot.