Tiny solar-powered drones could stay in the air forever ♾️☀️ A drone weighing just 4 grams is the smallest solar-powered aerial vehicle to fly yet, thanks to its unusual electrostatic motor and tiny solar panels that produce extremely high voltages. Although the hummingbird-sized prototype only operated for an hour, its makers say their approach could result in insect-sized drones that can stay in the air indefinitely. https://www.newscientist.com/article/2439277-tiny-solar-powered-drones-could-
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