Could Microscopic Robots Run Through Your Veins?

Four-legged robots, the width of a hair in size, can be powered by shooting lasers shooting into onboard solar cells.

antastic Voyage is a science fiction film from 1966. The movie involves a submarine crew. The characters have shrunk down to microscopic size and travel into the body of an injured scientist. Spoiler alert: The group ultimately repairs his brain by destroying a blood clot.