Science games

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Games:

 * Biogenesis
 * Boxcar 2d
 * Celestia
 * Elite
 * Flow
 * Kerbal Space Program
 * Lunar Flight
 * Moonbase Alpha
 * Orbiter Space Simulator
 * Phun
 * Piette's falling sand game
 * Pioneer
 * Powder toy
 * Spacechem
 * SpaceEngine
 * Space Station 13