This week's featured article
|Pentadecathlon is a period-15 oscillator that was found in 1970 by John Conway while tracking the history of short rows of cells (see one-cell-thick pattern). Indeed, 10 cells placed in a row quickly evolve into this object, which is the most natural oscillator of period greater than 3. In fact, it is the fifth or sixth most common oscillator overall, being about as frequent as the clock, but much less frequent than the blinker, toad, beacon or pulsar. It is the only known oscillator that is a polyomino in more than one phase (besides the blinker).
In the news
|The LifeWiki contains one of the most comprehensive catalogues of patterns available on the internet. Within it you will find:
Did you know...
- ... that no pattern inside a 6×6 bounding box is a Garden of Eden?
- ... that Garden of Eden patterns with only 45 ON cells have been found?
- ... that it is known that no Garden of Eden patterns exist that are 1, 2, or 3 cells high, but that it is currently an open question whether a 4-cell-high GoE can be constructed?
- ... 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?
- ... that in 2016, patterns were found that have great-great-grandparents but no great-great-great-grandparents?
- ... that no way is known for a 3×3 pattern to be tiled into an M×N rectangle to produce a Garden of Eden, but that there are 4×3, 4×4 and larger tiles that can be repeated in this way to produce GoEs?
- ... that there are spaceship stabilizations of agars?
- ... that block is the only known finite strict still life where each living cell has exactly 3 neighbours?
- ... that all strict still lifes up to and including 14 cells have been found by apgsearch in asymmetrical 16×16 soups?
- ... that c/2 orthogonal and c/4 diagonal were the only speeds of spaceships seen to emerge from asymmetric soups on Catagolue until 2020?