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the wiki for Conway's Game of Life.
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This week's featured article

Kickbackreaction.png

The kickback reaction is a collision of two gliders resulting in a single glider travelling in the opposite direction to one of the original gliders. This is important in the proof of the existence of a universal constructor, Bill Gosper's total aperiodic, and many other constructions.

Besides the 90-degree collision shown here, one other two-glider collision with gliders meeting at 180 degrees also produces a clean output glider, and may also be called a "kickback reaction".

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Pattern collection

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4.5 MB .zip archive containing the 3500+ RLE pattern files used on the wiki

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