From http://sciam.com/article.cfm?articleID=C0D3CD91-E7F2-99DF-3D5399013D3691D5&sc=WR_20070724\
"The 33-year-old Finnish biologist, aided by genealogists, has pored through centuries-old tomes (and microfiche) for birth, marriage and death records, which ended up providing glimpses of evolution at work in humanity's recent ancestors. Among them: that male twins disrupt the mating potential of their female siblings by prenatally rendering them more masculine; mothers of sons die sooner than those of daughters, because rearing the former takes a greater toll; and grandmothers are important to the survival of grandchildren. "I'm trying to understand human reproductive behavior from an evolutionary perspective," Lummaa says."
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