Reminds me of this puzzle (http://en.wikipedia.org/wiki/Common_knowledge_%28logic%29#Example). In fact, just read the whole page, it’s good stuff, and mentions Pinker.
Reminds me of this puzzle (http://en.wikipedia.org/wiki/Common_knowledge_%28logic%29#Example). In fact, just read the whole page, it’s good stuff, and mentions Pinker.