Tiny robots powered by living muscle have been created by scientists
But when biological cells become attached to silicon - are they alive?
"They're absolutely alive," Professor Montemagno told BBC News. "I mean the cells actually grow, multiply and assemble - they form the structure themselves. So the device is alive."
The notion is likely to disturb many who already have concerns about nanotechnology.
Played with a 5mW green laser last April in Tokyo and it was loads of fun. Now you can get 40-60mW ones, which can burn though plastic film and be seen up to miles away and produce a solid "light saber". Droool.