http://en.wikipedia.org/wiki/List_of_animals_by_number_of_neurons
numbers of neurons
http://faculty.washington.edu/chudler/facts.html
brain weights plus lots of other numbers
http://www.bfwpub.com/pdfs/kolbwhishaw5e/ch02part2.pdf
brain weights / body size
http://faculty.washington.edu/chudler/dev.html
brain weights vs age
http://intramural.nimh.nih.gov/chp/articles/lenroot-2006-nbr.pdf
growth of the brain with charts
http://en.wikipedia.org/wiki/Sound_pressure
