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A suspected rhino poacher is killed in a shootout in a South African preserve.

Eighth graders made modest gains in national science testing, with Hispanics and blacks narrowing the gap between their white and Asian peers, the government reported Thursday.

Inscriptions on a wall of what appeared to be a studio for royal scribes in Guatemala may date to the early ninth century, several hundred years older than the examples previously known.

Vesta, the second-largest asteroid in our solar system, has planetlike features but fails the gravitational bully test for full status, says a report in Friday’s issue of the journal Science.

With the growing availability of tools to modify organisms, a creature like the bird imagined in the “Hunger Games” series is not an impossible fantasy.

Some designers repurpose old things for aesthetic satisfaction as well as environmental reasons.

The senator says the nation must address greenhouse gas emissions.

A student team produces a handy online tool allowing car buyers to compare the full costs and benefits of cars.

A mini-mammoth that stood about three feet high joins Sifrhippus, the first horse, which shrank to the size of a cat as the climate warmed about 56 million years ago.

A mini-mammoth that stood about three feet high joins Sifrhippus, the first horse, which shrank to the size of a cat as the climate warmed about 56 million years ago.

Few animals have been as closely documented as the bottlenose dolphins of Sarasota Bay, Fla., with their whistles, burst-pulsed sounds and broadband clicks.

Few animals have been as closely documented as the bottlenose dolphins of Sarasota Bay, Fla., with their whistles, burst-pulsed sounds and broadband clicks.

Despite the complications of last year’s expedition, archaeologists return to Belize in hopes of a more successful dive for ancient Maya offerings.

Despite the complications of last year’s expedition, archaeologists return to Belize in hopes of a more successful dive for ancient Maya offerings.