Stunning photos of Yellowstone beauty spots in 1871 and today

Dosing farm animals with antibiotics increases greenhouse gas emissions from cow dung, research suggests.

The sun-powered aircraft Solar Impulse takes off from Dayton, Ohio, on a 750km flight to Lehigh Valley in Pennsylvania.

Chinese drinkers may have been brewing beer as many as 5,000 years ago, new research suggests.

A study finds that bizarre, tentacled worms which live attached to crayfish are at risk of extinction - because the crayfish themselves are endangered.

Success is declared by the team drilling into the Chicxulub Crater, the deep scar made in the Earth's surface by the asteroid that hastened the end of the dinosaurs.

A possible grizzly-polar bear hybrid has been shot by a hunter in northern Canada.

The contract is signed that will lead to the construction of one of this century's key astronomical facilities - the European Extremely Large Telescope.