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A tiny robot with 'caterpillar' legs and the equivalent strength of a human able to easily lift a 26-seat mini-bus could also be used to deliver drugs inside the human body.

Researchers say that the robot is capable of carrying relatively heavy loads and adapting to adverse environments and could pave the way for medical technology advances. They say it can move efficiently inside surfaces within the body lined with, or entirely immersed in, body fluids such as blood or mucus.