This week's featured article

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 90degree collision shown here, one other twoglider 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 8bit 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 4cellhigh orphans are impossible?
 ... that 6cellhigh Garden of Eden patterns were constructed as far back as 1973, but 5cellhigh GoEs were unknown until Steven Eker found some in 2016?

Pattern collection

The LifeWiki contains one of the most comprehensive catalogues of patterns available on the internet. Within it you will find:

