Frogs re-evolved "lost" bottom teeth after more than 200 million years, according to new research.

Nasa officials gather at Kennedy Space Center in Florida to mark the 25th anniversary of the explosion of space shuttle Challenger.

Central Chile retains the conditions necessary to generate a major earthquake close to the site of last February's Magnitude 8.8 event, scientists say in a new report

New pictures have been released of an isolated tribe living in rainforest on the Brazil-Peru border.

The UK is likely to feel bigger costs from climate change than most other EU countries, a report concludes - mainly due to projected sea level rise.