The smallest robots ever built are small enough to hold in your hand, and they can walk just like the big ones. What's more, these microrobots are biodegradable.
Researchers at Japan's University of Tokyo have built several different robots that are only one millimeter tall. The hardest part was working out how to guide them around obstacles without them bumping into things. While they were building the robot, the researchers thought it would be cool if you could eat it after it had done its job.
So they tried sprinkling some onto food and found that zooplankton ate them right up – apparently mistaking them for food particles! And even though a few got eaten along with their jobs, most of them were excreted whole. So they're safe to eat, but the researchers think that their biodegradability will be a bonus for clean-up efforts after disasters like oil spills.
Though these robots have been created as an advance in microrobotics technology, they also have medical applications. The team hopes to use them as drug carriers, with the aim of building a device less than half a centimeter wide that can inject medicines into individual cells. They would stroll around the body delivering medicine only where it's needed – without having to go through all those big old clunky veins and arteries!
Reference: https://library.oapen.org/bitstream/handle/20.500.12657/25252/1004842.pdf
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Robots it's good, but I think that if they continue like this, robots all replace human jobs, most people will be jobless and would resolve to bad things like stealing and a lot of bad things.