Aperiodical Maths News - <a href="https://conwaylife.com/forums/viewtopic.php?f=2&t=1437&p=163664#p163664">a period 19 oscillator has been found in Conway's game of life</a> <br> <br> (via <a href="https://mathstodon.xyz/@isaacg/110710615935015667">Isaac Grosof</a>)