Robots have taken over many of America's factories. They can explore the depths of the ocean, and other planets. They can play ping-pong.

But can they pick a strawberry?

"You kind of learn, when you get into this — it's really hard to match what humans can do," says Bob Pitzer, an expert on robots and co-founder of a company called Harvest CROO Robotics. (CROO is an acronym. It stands for Computerized Robotic Optimized Obtainer.)