Robot piloted by a ball of algae is powered by photosynthesis

https://www.newscientist.com/article/2304571-robot-piloted-by-a-ball-of-algae-is-powered-by-photosynthesis/

"directly harness photosynthesis to make actuators, biosensors and bioprocessors... Marimo Actuated Rover Systems (MARS)... autonomous, low-cost, lightweight, compact size, photosynthetically powered rover is reported. The potential for further system enhancements are identified and under development"

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