Hi, David. 

Re that math article:  I read it Sat. evening when it was posted on the NYT website, and found it full of errors (such as assuming that n-manifolds are subsets of n+1 space).  Wrote Johnson a polite note pointing some of them out, and he responded saying mostly that inaccuracies are justified when writing for a lay audience.

What do you think?

Regards,

Dan