Editor's choice
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Failure of Nasa's Kepler telescope puts search for another Earth in peril
Telescope orbiting the Sun has lost part of its stabilising system, making it too inaccurate to hunt for another Earth
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The aliens are already here – share your pictures and videos
Have you spotted incontrovertible proof of an alien invasion here on Earth? Share your astonishing photos and videos
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Human embryonic stem cells created from adult tissue for first time
The cells, made with cloning technique behind Dolly the sheep, have the potential to regenerate damaged organs and tissues
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Podcast: living in a random universe
Audio (40min 30sec) Brian Clegg discusses the deeply random nature of the universe. Plus, Hanne Albert on her discovery that antibiotics may alleviate a particular kind of lower back pain
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