An error

a few people have written to point out that on p. 68 I make a reference to MS and dopamine.

I'm going to go through my archives for the source, but it appears as though I got the ailment wrong. My apologies to anyone who has a friend (or is personally) suffering with MS. I'm sorry if I caused any concern or false hope.

Thanks for writing and I'll have this confirmed or changed for the next printing.