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A sawtooth is a finite pattern whose population grows without bound but does not tend to infinity. In other words, it is a pattern with population that reaches new heights infinitely often, but also infinitely often drops below some fixed value. Their name comes from the fact that their plot of population versus generation number looks roughly like an ever-increasing sawtooth graph.
The first sawtooth was constructed by Dean Hickerson in April 1991 by using a loaftractor beam (a technique that was also used in the construction of sawtooth 633). The least infinitely repeating population of any known sawtooth is 177, attained by Sawtooth 177; the smallest bounding box of any known sawtooth is 62 × 56, attained by a variant of the same pattern, Sawtooth 195.
June 1-2: Goldtiger997completes the critical final-stage synthesis of a lobster spaceship via an almost completely diagonally symmetric collision between 39 gliders and a 175-bit still lifeconstellation; a collaborative effort produces a 186-glider construction recipe the same day, reduced to 118 gliders over the next two days.
May 17: lumibuilds a maximally Golly-friendly self-synchronized linear replicator, speed 256c/1048576, bounding box 65676 × 65520, minimum population 16702; each new child copy is precisely in sync with the parent.
May 8: lumi completes another large reduction in linear propagator design, from February's 83K-cell design down to only 12372 cells, building on recent universal-constructor optimization work by russellsprouts and inductivetype.
May 8: vilc uses 98 gliders to synthesize 36P3H1V0.2, which had been one of the four smallest spaceships with no known glider synthesis.
... that there are now over two hundred known Herschel conduits, counting stable conduits only, and a much larger number if oscillator-supported conduits are included?
... that a pattern has been constructed that calculates and prints out the digits of pi in decimal, and a similar one prints out the decimal digits of the Golden Ratio?
... that several different patterns have been constructed to calculate and display the sequence of prime numbers, and some have been adapted to display only twin primes or Fermat primes?
