For a penny per liter, people in the developing world should be able to remove most pathogens and toxic pollutants from their home drinking water. (p. 403)

The drug finasteride, given to alleviate baldness and prostate problems, might prevent some cases of prostate cancer. (p. 403)

The sharpest images of the sun ever taken, released last week, show our stellar neighbor’s rugged surface in new and surprising detail. (p. 404)

Over the past 90 years, rising water temperatures in Lake Tanganyika have led to dramatic losses of productivity among the microorganisms that form the base of the lake's food chain. (p. 404)

The vertebrate spine has provided inspiration for making new structures that heal when heated. (p. 405)

The current U.S. Supreme Court of nine judges behaves as if it were made up of 4.68 "ideal" justices who make their decisions completely independently, a mathematical analysis suggests. (p. 405)

The search is on for creatures that have evolved for eons without sex. (p. 406)

At the height of the last ice age, northern portions of Alaska and the Yukon Territory were covered with an arid yet productive grassland that supported an abundance of large grazing mammals, fossils suggest. (p. 408)

Dying cells secrete chemicals that attract other cells that specialize in disposing of cellular corpses. (p. 408)

The first tests of temperature control in African cicadas have found species with a strategy that hogs energy but reduces the risk of predators. (p. 408)

Even low concentrations of lead in a girl's body may delay her reproductive maturation. (p. 408)