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https://en.wikipedia.org/wiki/Yakovlev_Yak-24 The Yakovlev Yak-24 (NATO reporting name Horse) was a twin-engine, tandem rotor transport helicopter developed in the USSR. In late summer 1952, the Soviet Union issued two design specifications for helicopters, with the intent of catching up to the...

https://www.extremetech.com/extreme/260272-astronomers-will-scan-interstellar-mystery-object-make-sure-not-spaceship ...."We know that ‘Oumuamua is from another solar system because it has an orbital eccentricity of 1.20, meaning it’s well past the sun’s escape velocity. Nothing that originated in...