The New York City subway cars taking on a second job on the ocean floor. Plus, a successful drone created using Leonardo da Vinci’s aerial screw design. And crows in Sweden are being trained to pick up litter.
The New York City subway cars taking on a second job on the ocean floor. Plus, a successful drone created using Leonardo da Vinci’s aerial screw design. And crows in Sweden are being trained to pick up litter.
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