For girls, the age of puberty has been falling since the 19th century. The same period has seen a similar decline for boys (source) In the United States and other Western countries, girls have been reaching puberty at earlier and earlier ages. A recent longitudinal study has examined this trend in white Americans born between... Read More

In 1972, the U.S. passed the Clean Water Act, despite a presidential veto by Richard Nixon. Did this act also end an era of unusually high estrogen levels in the environment? (cartoon source) There has been much concern over the presence of “environmental estrogens” in our drinking water and elsewhere in the environment. These are... Read More