The afterword is quite knowledgeable in summarizing work since the original publication. I am uncertain if Poundstone talked to anyone in the community or just did his own research online. Anyone know?

I thought the above might be of general interest. What follows is personal and rambling, so feel free to stop here.

I was also surprised to see (right above the spacefiller) a 1x39 pattern of 28 cells that grows infinitely. Google books has the page in question. https://books.google.com/books?id=0FHqb ... &q&f=false

I vaguely remembered searching for this pattern (described here) to answer a question posed on the Life mailing list:

`x = 39, y = 1, rule = B3/S23`

8ob5o3b3o6b7ob5o!

I gave little thought to this pattern since then, but seeing it by surprise in a Dover publication has made me appreciate it more. I wonder if any other infinite growth patterns are as easy to memorize (at least for those who have trouble memorizing pictures). This one can be summarized as a 9-digit number 815336715, as RLE with the understanding that runs of live and dead cells alternate (and it starts with live cells, naturally). 8 live, gap of 1, 5 live, gap of 3, etc.

For those who want to "amaze your friends" with about as much effort as learning a phone number, you can memorize this and enter it into Golly or other viewer by hand. Or maybe it would work as a bar bet... whoa! infinite growth from one line; challenge anyone else to duplicate the feat. (Sorry that was the rambling part; I used to be able to enter the p30 glider gun by hand fairly fast, but this is an easier trick to teach.)