Newly disclosed "Ghost" drones that are part of America's latest arms package for Ukraine were developed by the U.S. Air Force for attacking targets and are destroyed after a single use, the Pentagon said on Thursday (April 21).

Over the past five years, robotic dogs have gone viral in captivating online videos showing them opening doors, performing aerobics, hauling trucks and pulling other stunts. In the pandemic era, they've been used to promote social distancing and reduce risks to medical staff hospitals.