Now technology is going from micro to nano and beyond. Department of Energy’s Sandia National Laboratories- Have developed a Lilliputian "machines" operating inside living cells. A robot which is smaller than a dime. It was so amazing..i got the video from there website.
This little fella have a an 8K memory processor as its brain and almost all type of sensors, gas sensors, a cam, microphone and collision detection. I think you guys will love this. I will give the links and you can see more info.
See this nano car. This is world smallest human made living machine. Size of a rice.hehe nice dhoa.. enjoy this nice tech. See below link for more information.