good reading for a rainy saturday

I came across this article while sifting through all the hype for the NYC Marathon.  It's a little long, but worth a read.  Makes me wonder if Michael Johnson will ever tackle that marathon.....?

"The Perfect Stride: Can Alberto Salazar straighten out American distance running?"

http://www.newyorker.com/reporting/2010/11/08/101108fa_fact_kahn