> arm and spun a ping-pong ball attached to a string around
> your head. This wouldn't affect your stance very much. If on
> the other hand you swung a bowling ball, the chances are
> you would loose your balance and fall over

Gravitation model of a solar system (Java + graphics)

http://arachnoid.com/gravitation/

Pretend to have powers on a celestial scale that would
get you a guest spot on Star Trek

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