The Flat-Twin engine is something special, and so it holds a place in history for its many uses and achievements.

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Related: How to debate a flat-Earther The Earth is about 42 million feet (12.8 million meters) wide, and even a tall adult’s viewpoint is just 6 feet (about 2 meters) above its surface.

Ever since the ancient Greeks first made observations of the circular Moon and the skies, scientists have known that the Earth is a sphere. We’ve all seen beautiful images of the Earth from space, ...