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the wiki for Conway's Game of Life.
Currently contains 2,640 articles.
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Today'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".

In the news

Did you know...

  • ... that all still lifes up to 17 cells can be synthesized at a cost of less than one glider per cell?
  • ... that the first elementary knightship, Sir Robin, was discovered only in 2018, with there having been a very close call in 2004?
  • ... that there is a 5 × 2 counterexample to the Coolout Conjecture, proving that patterns that are internally compatible with stability can not always be made part of a larger still life, no matter what cells are added around the edges?
  • ... that a Conway's Life pattern representing a complete programmable 8-bit computer, consisting only of buckaroos, p60 glider guns, and glider duplicators, was completed in November 2016?
  • ... that whilst no elementary oblique spaceships were found in B3/S23 until 2018, and none have occurred naturally, at least two naturally occurring reactions have been discovered in B38/S23 that travel in an oblique direction?
  • ... that not all statorless oscillators are phoenixes, but statorless period 2 oscillators must be phoenixes?
  • ... that no pattern inside a 6 × 6 bounding box is a Garden of Eden?
  • ... that Garden of Eden patterns with only 45 live cells have been found?
  • ... that there are orphans that are 5 cells high, but 4-cell-high orphans are impossible?
  • ... that 6-cell-high Garden of Eden patterns were constructed as far back as 1973, but 5-cell-high GoEs were unknown until Steven Eker found some in 2016?          
Showing 10 items out of 197 More did you know...

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