Unfortunately, nobody knows what happened to the Digesting Duck. There is, however, a museum in Grenoble that has a replica on display, made by a clock-maker.

While you probably know Nikola Tesla more for his incredible electric coils, he actually has next to his name in the field of robots.

When Nikola was looking for a way to demonstrate his wireless transmission system (what we now know as radio waves), he placed an iron boat in the water at during a conference and controlled it with a remote--the boat simply picked up the radio signals from the remote and carried out the commands from Nikola. Sadly, at the time, nobody quite realized how significant the remote-controlled boat would be to future robotics, toys, radio, and other devices we take for granted today.