Watching a diving bird vanish beneath the water can feel almost unreal. One moment it cruises through the sky. Seconds later, it swims after prey before returning to the air. Around 100 bird species ...
Tübingen, Germany – Current flying objects face a trade-off: Drones with propellers for instance are very agile and able to hover, however they use up a lot of energy. Airplanes on the other hand ...
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