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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. Sponsors: - Munk Pack, Use code KRH at Munkpack.com for 20% off your first purchase
- Jenni Kayne, Use code KRH at jennikayne.com for 15% off your first order
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