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A major new study of smoking and death has banged more nails into the coffin of cigarette smoking, though chances are it will do little to persuade any of the 42 million American smokers to quit. If current smokers have not already responded to the well-established links between smoking and 21 diseases that together cause 480,000 deaths each year, adding another five diseases and 60,000 deaths to this grisly total is unlikely to make a difference - at least not by itself.

When women smoked daily during pregnancy, researchers identified 6,073 places where their babies' DNA was methylated differently from the DNA of nonsmokers' infants. Many of the differences were found on or near a collection of genes related to lung and nervous system development, smoking-related cancers and birth defects such as cleft lip and palate.

Genome Sciences Education Outreach at the University of Washington in Seattle develops innovative programs that bring leading-edge science to teachers and students in K-12 schools.

The Department of Genome Sciences at the University of Washington in Seattle develops innovative programs that bring leading-edge science to teachers and students in K-12 schools.

That's why the annual County Health Rankings are important. They not only show health standards at a local level-they also show the multiple factors that pertain to health outcomes, everything from racial segregation and sleep patterns to smoking rates and access to decent food.

Science denial has real, societal consequences. Denial of the link between HIV and AIDS led to more than 330,000 premature deaths in South Africa. Denial of the link between smoking and cancer has caused millions of premature deaths. Thanks to vaccination denial, preventable diseases are making a comeback.

It's an inevitable side effect of longevity: your hair will turn gray. In this episode, Sophia Cai chats about the chemistry of your natural hair color, why it eventually turns white, and how scientists may be able to slow that graying down.

The behavior of a person's genes doesn't just depend on the genes' DNA sequence - it's also affected by so-called epigenetic factors. Changes in these factors can play a critical role in disease.