A fleshy membrane wing would cover these limbs. But to actually fly, the rest of our body would have to produce enough power, which would require strong muscles. In birds, an average of 16% to 18% ...

Airplane wings would rotate out from the body of ... Current rechargeable lithium-ion batteries would power a flying-car ride for only 20 to 30 minutes, Du says. And while a car that runs out ...