What if planets were not (nearly) spherical but rather torus/donut shaped? Topics discussed: types of tori, stability of torus planets, gravity vs centrifugal force, curvature, tidal forces, seasons and day/night cycles, climate, hurricanes, coriolis forces, tectonics, internal heating, moons, and the four color theorem.
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CREDIT:

► Anders Sandberg: http://goo.gl/hc8pys

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LINKS:

►Torus on Wikipedia: http://goo.gl/QbdSKA
►Topography of a Twisted Torus: https://goo.gl/zlAe3q
►Embedding a Torus: https://goo.gl/dBxHSy

►Torus-Earth: http://goo.gl/99xZXK
►Torus-Earth 2: http://goo.gl/xlK4iW
►Toroidal World: http://goo.gl/9aWjck
►Torus Planet Simulation: https://goo.gl/Esm8OX
►Discussion on Torus planets: http://goo.gl/XMLV7D