Not by me, of course. I’m going to have to read this thing about 10 times to internalize it.
This was put together by Steve Levitt of Freakonomics fame who also couldn’t work it out so he called on some friends to do it for him.
This article is a MUST read for all of you – and I MEAN it! The Mom has spoken.
Shout outs to my former colleague and current friend and occasional (as in once, so far) triathlon training buddy, Tim Lang.
21st-century-mom.com 
Thank you, that was really helpful and informative!
you have no clue how much this terrifies me.
andra also has a good link to an NPR piece – very interesting.