Top Minds have limited contacts

Terry Tao falls down rabbit hole:

In logic, there is a subtle but important distinction between the concept of mutual knowledge – information that everyone (or almost everyone) knows – and common knowledge, which is not only knowledge that (almost) everyone knows, but something that (almost) everyone knows that everyone else knows (and that everyone knows that everyone else knows that everyone else knows, and so forth).

https://terrytao.wordpress.com/2016/06/04/it-ought-to-be-common-knowledge-that-donald-trump-is-not-fit-for-the-presidency-of-the-united-states-of-america/

Scott Aaronson jumps in:

“daddy, in the Good Days, the days before the War of the Small-Hands Insult, the days when there was plentiful food and water and Internet, didn’t you have what used to be called a ‘blog’?  Then why didn’t you speak out on this blog, why didn’t you do whatever tiny amount you could to prevent this?”

http://www.scottaaronson.com/blog/?p=2777


Lenny asks friends to please come in:

Letter to My Friends, by Leonard Susskind  http://www.scottaaronson.com/blog/?p=2841