The day may be coming when doctors inject microbots into your blood to fight disease.
Australian scientests say they've produced electric motors tiny enough to power microbots through blood vessels in the body and the brain. The microbots would be guided by remote control where current medical catheters cannot reach, into small blood vessels to unblock clogged arteries.
You can learn more about the microbot research at http://stacks.iop.org/JMM/19/022001.
