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 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).
 September 19: MathAndCode and Adam P. Goucher construct a 17glider reverse cabertosser, proving that all synthesizable patterns can be made with no more than 17 gliders and that all synthesizable still lifes can be constructed with no more than one glider per bit.
 September 19: Goldtiger997 synthesizes 55P9H3V0, the first period9 spaceship to be synthesized.
 September 18: Pavel Grankovskiy constructs a complete Speed Demonoid, using double crabstretchers to accelerate a selfconstructing spaceship to 3492022/17833792=1746011/8916896 ≈ 0.1958c, very close to c/5. The new spaceship can be adjusted to match any rational speed slower than 2c/9.
 September 15: wwei23 discovers several new 3engine Corderships, including one that cleans up its trailing blocks with sideways gliders, similar to a 5, 6, or 7inarow Cordership.
 September 917: wwei23 assembles a new type of period192 4inarow Cordership, and later constructs glidertoCordership and Cordershiptoglider converters for it.

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 all currently known standard Herschel conduits produce the same Herschel greatgrandfather pattern, except for Fx158?
 ... 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, an Nbit period2 oscillator can be constructed for any odd integer N using no more than 45 gliders, and for any even integer N using no more than 46 gliders, using a temporary tubstretcher?^{[needs update]}
 ... 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?

