Dioxin cuts the chance of fathering a boy

A 1976 explosion in an Italian factory rained TCDD over thousands of nearby homes. This unintended byproduct of herbicide manufacture is the most potent dioxin known. A new study finds that men who received large TCDD exposures from the accident have fathered fewer sons than expected. Indeed, the more dioxin a man picked up, the more likely he was to have daughters.