Btw. If you've ever wondered what a complete idiot writes like, you could do worse than read this attack on Drysdale's review. Completely missing the basic soundness of the attack and buying in to Wolframs previously mentioned catchall defense against academic criticism, Stephen Harris basically says nothing, and does so very angrily. In contrast to Drysdales careful reading of all of Wolframs book, his criticism hinges on 1 criticism of Drysdale's - and fails to say anything important about that even.