This week's featured article

Tanner's p46 is a period46 oscillator that was found by Tanner Jacobi in 2017 involving a pi running a small conduit. Mark Niemiec posted a 19glider synthesis two hours after its discovery. Various guns can be constructed by combining two of the oscillators themselves, one of which produces middleweight spaceships without any gliders required.

In the news

 October 16: Andrew Trevorrow makes available the first beta builds for Golly 4.0, supporting Python 3.x and new rule types and neighborhoods, and enabling multicolor "Super" and "History" support for a wide range of twostate rules.
 September 27: A burloaferimeter variant appears in an asymmetric soup found by Rob Liston, making it the first natural period7 oscillator.
 September 26: Pavel Grankovskiy completes Speed Demonoid version 2, removing the 2c/9 limitation; a Golly script can now build a spaceship with any rational diagonal speed below c/4 (subject to some practical size limitations).

Pattern collection

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


Did you know...

 ... that eater 1 is the smallest asymmetric still life?
 ... that in Life, no spaceship can exist with a speed of (m,n)c/x where (m+n)/x > 0.5?
 ... that even without using fixedcost reverse caber tosser technology, an Nbit strict still life – specifically, some length of long long (...) boat or ship – can be constructed for any odd integer N using no more than 20 gliders, and for any even integer N using no more than 21 gliders, using a temporary tubstretcher?
 ... that even without using fixedcost reverse caber tosser technology, some specific Nbit period2 oscillators can be constructed for any even integer N using no more than 27 gliders, and for any odd integer N using no more than 29 gliders, using a temporary tubstretcher?
 ... that it is currently an open question as to if there exists a periodic pattern whose only predecessors are its own evolutionary sequence?
 ... that it was proved in the early 1970s that reflectorless rotating oscillators exist in Life, but none were found until 2018 when Adam P. Goucher completed the 0E0P metacell?
 ... that there are currently known elementary spaceships with speeds c/7 and c/10 orthogonal, but none with c/8 or c/9?
 ... that there are currently known elementary spaceships with speeds c/7 and c/12 diagonal, but none with c/8, c/9, c/10 or c/11?
 ... that while the speed limit for orthogonal spaceships in rules using the Moore neighbourhood is c orthogonal, spaceships in Larger than Life rules are capable of breaking this barrier?
 ... that without the use of adjustable glider loops, there are no known oscillators with periods 43 or 53?

