IBM has invented coffee drones – and they predict when you need a cup

"To Ryan Calo, a University of Washington School of Law drone expert, the coffee drone proposal is trying to do too much.

"It's a combination of technology that is ready for prime time and technology that clearly is not ready for prime time," he said. "It's a drone that flies coffee around. It’s going to be hard, cross referencing all these (factors) ... Why not use a land-based cart?""