A Bossa Nova Robotics scanning device moves through an aisle at a Walmart Supercenter during the annual shareholders meeting event on May 31, 2018 in Rogers, Arkansas. The retailer has found different, sometimes simpler solutions prove just as useful as the machines. Rick T. Wilking/Getty Images Walmart Inc. WMT, +0.91%

Dog Health

With a training technique commonly used to teach dogs to sit and stay, Johns Hopkins University computer scientists showed a robot how to teach itself several new tricks, including stacking blocks. With the method, the robot, named Spot, was able to learn in days what typically takes a month. By