Cnidarians, including corals and many jellyfish, feed and defend themselves with stinging capsules. Some sea slugs have evolved several lines of defense.
A fossilized human jawbone discovered in Israel. The find may suggest that Homo sapiens first migrated out of Africa at least 50,000 years earlier than previously thought.
An illustration of Haringtonhippus francisci, an extinct horse species that was found in North America during the last ice age. Rick Hunter, a Utah paleontologist, said the horse, whose skeleton was discovered in a Utah backyard, may have looked similar to this.
Fully programmable robots were on display at the Humanoids 2013 conference in Atlanta. The goal is to enable them to work effectively and even autonomously in emergency situations.
Dr. Odile Madden, of the Getty Conservation Institute in Los Angeles, holding a piece of degrading plastic for use in trying out new methods of preservation.
The Caño Cristales in Colombia, home to Macarenia clavigera, which turns the river bright colors in the rainy season. It has become a tourist attraction, but oil reserves nearby have pitted the government against a petroleum company.
This mummified, severed head was recovered from an ancient Egyptian tomb in 1915. Scientists needed to collect DNA to figure out whom the head belonged to.
Illustrations by R. Kikuo Johnson
An interrogation room in a police precinct in Harlem. Close to 20 percent of interrogations occur during normal sleep hours, midnight to 8 a.m., a new study notes.
The International Space Station will stay in orbit for at least four years after 2020, NASA said.
Marmot pups near Crested Butte, Colo. Researchers tracked yellow-bellied marmots’ interactions for 13 years and found that more solitary marmots lived longer lives.
Transportation Security Administration employees at work. The agency employs thousands of officers who try to spot suspicious passengers.
Alfalfa leafcutter bees and their brood cells in a hut built by Jim Watts, who runs a business providing bees to farmers out of Ontario, Ore.
Orcas from pod J in Puget Sound just west of Seattle. The number of orcas in the area, listed as endangered since 2005, has dwindled to a 30-year low.
The Sorpe reservoir in northwest Germany, one of four freshwater reservoirs observed in a recent study that found that carbon dioxide absorbed in lakes, rivers and streams can affect entire ecosystems.
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