The latest stories from the Science & Environment section of the BBC News web site.
Red Planet 'may not be lifeless'
Carbon-rich organic molecules, which serve as the building blocks of life, may be present on Mars after all, say scientists.
Insect brains to fight MRSA
Cockroach and locust brains are a rich source of antibiotics powerful enough to tackle MRSA, researchers say.
Century man
How likely is it that you'll live to be 100 years old?
Brilliant ideas
The secrets behind some of the UK’s newest inventions
Blair in climate inaction warning
Former UK Prime Minster Tony Blair warns world leaders they may pay a heavy price in history if they fail to tackle global warming.
Tiny solar cells fix themselves
A mix of chemicals borrowed from plants with tiny tubes of carbon can spontaneously create tiny, self-repairing solar cells.
Danish rocketeers postpone launch
A group of Danish rocket enthusiasts trying to launch a dummy 30km into the sky abort the mission when a valve on their rocket freezes up.
Death of a star
The Hubble telescope re-images supernova first seen in 1987
Reading Arabic 'hard for brain'
Israeli scientists believe they have identified why Arabic is particularly hard to learn to read.
Plans for solar 'close encounter'
Nasa is aiming to get closer to the Sun than ever before, with plans to plunge a car-sized unmanned spacecraft into the star's outer atmosphere.
Panda twins delight Japanese zoo
New-born twin giant pandas made their first public appearance at a zoo in Japan on Friday in Shirahama.
Wolves fail to halt aspen decline
The re-introduction of wolves to a US National Park has not helped re-establish quaking aspens, as many researchers had hoped.
Island 'super-sized' mice studied
Researchers begin a study of the "super-sized" mice found on a tiny Scottish island in the Outer Hebrides.
Mighty mouse study on St Kilda
Researchers begin a three-year study to uncover the secrets of St Kilda's super-sized field mice.
Now you see it...
Inside the Royal Navy's powerful and stealthy attack submarine
Technique to trace persistent CFCs
Ultrafine measurements of atmospheric gases could help scientists track down the last sources of CFCs thought to be slowing the recovery of the ozone layer.
Openness urged on UK's emissions
The government's chief environment scientist calls for more openness in admitting the UK's cuts in greenhouse gas emissions are an illusion.
Did the Universe need a creator?
There is no place for God in theories on the creation of the Universe, the physicist and mathematician Professor Stephen Hawking has said.
Creation was Godless says Hawking
There is no place for God in theories on the creation of the Universe, Professor Stephen Hawking concludes in a new book.