 Dr. Massart and colleagues from the University of Pisa studied the increased prevalence of precocious puberty in a region of northwest Tuscany.This region of Italy is represented by a high density of navy yards and greenhouses where exposures to pesticides and mycoestrogens (estrogens produced by fungi) are common.Although unable to identify a definitive cause of the high rates of precocious puberty, the authors concluded environmental pesticides and herbicides may be implicated.