On a side note, if you don't know who Terrence Tao is you should read his bio. It's pretty interesting: child prodigy, math olympiad, Fields Medal etc.
I've been told they've recently released new filtering tech for the great firewall that blocks all proxy's and published tor nodes.
Tor isn't playing it up, but they're starting to develop a subset of nodes that aren't published and wont be immediately blocked. Because they're obscuring their efforts I can't find a link for you. A shell account and an ssh socks proxy will still work as far as I know.
On the last slide he writes that "We believe that the primes do not observe any significant pattern beyond the obvious ones (e.g. mostly being odd)..."
But is there an even prime other than 2? I guess not, otherwise it will be divisible by 2.
Yes, I know it's a nitpick but if there is only 1 exception, it is not mostly. If he says mostly, there is a suggestion that there may be other even primes.