The Radio Robot Mk 2, AKA Radio Man was the brain child of Swiss engineer August Huber. It not only had microphone ears, leg-mounted batteries, and shortwave control, but it is indisputably the first robot in history to be able to yodel. Radio Man was featured in the April 1939 issue of Popular Science. He’s 7 feet tall and took 10 years to complete. It supposedly could walk, talk, sing, or yodel at his master’s command.