Because only 14 of the 93 nuns in his original study group had died, Snowdon expanded it to include 11 brains from other deceased nuns who had also written autobiographical sketches in their youth. (discovermagazine.com)
Researchers got their hands on archival autobiographical sketches written by 74 nuns, from Baltimore and Milwaukee, completed between ages 19 and 37 years. (scientificamerican.com)
Luckily for Snowdon, they had all been required to write brief autobiographical sketches on entering the convent in their early 20s. (discovermagazine.com)