The story is just titled all wrong, so the topic title would actually be more appropriate. I was skeptical until they started talking about thyroid levels, the months when the kids were conceived meant nothing to me.
However, my mother had lymphatic cancer that had infected her thyroids, so she has to take supplements all the time now. That's what drew my attention as both my sister and I are HORRIBLE at math, but we're both very skilled in learning new languages.
http://news.yahoo.com/s/nm/20070508/...performance_dc