The Kopp-Etchells Effect – Helicopter Rotor Blades Glow in a Dust Cloud

• September 3, 2009 • Leave a Comment

Posted in 📷 P H O T O G R A P H Y, 🔬 S C I E N C E/T E C H : N A T U R E 🌲, 🕶️ C O O L : S T U F F
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