A common heart procedure called angioplasty doesn't save lives if it is performed more than a couple of days after a heart attack. (p. 365)

Measurement of an electrical abnormality in the heart aids doctors in determining who is most at risk for cardiac arrest. (p. 365)

Men whose hearts beat faster over time are likely to die earlier than those whose hearts keep an unchanging cadence year after year, according to a 20-year study. (p. 342)

In the Pacific Northwest, sea lice that spread from cultivated salmon to their wild counterparts have become major parasites affecting the wild population. (p. 333)

A chemical found in turmeric may prevent cognitive impairment. (p. 316)

Novel heart devices fashioned mainly from materials that the body can absorb or break down have made their debut in heart patients. (p. 277)

Pesticide-containing waters leave frogs more susceptible to fungal infections than pristine environments do. (p. 270)