When Calvin plays chess against the mechanical bear, the bear moves a pawn on the third rank forwards by two. In chess you can only play the pawn forwards from its starting position, which it was not on, making it an illegal move. See more
It begins like this. Two billion years ago, an amoeba... Wait, let's let's back up. I've skipped too many connections. Out of nothing, in an instant, everything. An infinite cosmic orgy of matter and energy, rubbing, bumping, and grinding together. There would be no galaxies, no suns, no planets, no life without collisions of heavenly bodies. Back to our amoeba. It engulfs a bacterium with unique powers, and voila. Earth's first photosynthesis-enabled organism. Maybe it was chance....