Convex geometry
An optical illusion that will mess with your brain (pics+vid)
Crazy UFO-like super Yacht can fly (pics)
Tetrahedron means four triangular surfaces in Greek, and is the name of a new prototype super yacht that can fly! The luxurious sea vessel that looks as if it was plucked right out of the future was designed to essentially fly over the sea surface, according to its designer, Jonathan Scwinge.
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