Human transmission to offspring and future generations of acquired epigenetic modifications has not been definitively established, although there are several environmental exposures with suggestive evidence. This article uses three examples of hazardous substances with greater exposures in...

Regulators must rely on science to understand problems and predict the consequences of regulatory actions, but science by itself cannot justify public policy decisions. We review the Environmental Protection Agency's efforts to justify recent changes to its National Ambient Air Quality Standards...