Nearly nine feet long (2.7 meters) and as big as a grizzly bear, a huge catfish caught in northern Thailand may be the largest freshwater fish ever recorded.

As the medical marijuana debate smolders on, scientists are revealing how cannabis and cannabis-derived chemicals benefit the severely ill.

Toxic venoms produced by cone snails are yielding potent new drugs to treat chronic pain, epilepsy, and other ailments.

Scientists have found that the hormone oxytocin, when sniffed, makes people more prone to trust others to look after their money.

Gay men respond differently than straight men when exposed to a suspected sexual stimulus found in male sweat, scientists say.

It's possible that a cancer cure awaits discovery in a rain forest plant. Scientist John Richard Stepp thinks the same can be said for weeds.

In ancient Babylonia pomegranate was considered an agent of resurrection. Now there is scientific evidence for the fruit's restorative powers.

Was Tutankhamun murdered? In an effort to solve that mystery and others, scientists CT-scanned the 3,000-year-old mummy of the ancient Egyptian king yesterday.

Time is running out to tackle an impending "explosive" AIDS epidemic in the Asia Pacific region according to a new report from the World Health Organization and other bodies.

National Geographic's gone to the dogs. Our Web site features dozens of news features, photo galleries, and more about our "Best Friend." Learn about the latest research into the origins and evolution of the most diverse mammal; read about the many ways in which dogs work for people; find lesson plans based on pooches.

The fossil remains of a giant rodent that weighed an estimated 1,500 pounds (700 kilograms)—as large as a modern buffalo—is helping scientists form a clearer image of what northern South America was like some eight million years ago.

A new species of dinosaur was announced by Indian and American scientists today: a 30-foot (9-meter), horned carnivore that hunted other dinosaurs 65 million years ago. The research was supported in part by the National Geographic Society. Includes a gallery of Rajasaurus images, charts, and maps.

Nothing thrills and chills quite like a snake—unless it's a really, really big snake. National Geographic's Ultimate Explorer TV series went around the world in search of constrictors—the family of giant snakes that literally squeeze the life out of their prey.

This season, storm chaser Tim Samaras logged 25,000 miles (40,000 kilometers) in search of funnel clouds. Most of the time, he never sees a tornado. But last month, Samaras scored his closest hit yet.

Researchers are developing a sonar system to help boaters steer off a collision course with the Florida manatee (Trichechus manatus Linneaus). The technology could be the difference between population growth and decline in the endangered species.