Why water freezes faster after heating 
A common chemical process may explain a bizarre property of water that has been a mystery since the time of Aristotle
Invention: Mile-high showers
This week's patents include a way to join the mile-high shower club, a cunning camera inspired by our darting eyes, and how to spot risky arterial plaques
Did Saturn's volcanic moon roll with it?
Enceladus may have tilted to stabilise itself after warm ice or rock welled up beneath the surface and ended up spewing from its south pole
Radar satellite maps the sinking of New Orleans
The new map provides the most detailed picture yet of the city's subsidence - it could help the engineers rebuilding the city avoid the faster-sinking areas
Satellite could open door on extra dimension
An exotic theory which predicts thousands of black holes exist in our solar system could be tested by NASA's gamma-ray-detecting space telescope, launching in 2007
Carbon nanotubes pinned down at last
A new technique fixes nanotubes exactly where needed for tiny transistors, helping remove a key hurdle to the development of nanotube-based electronics
Heart may be home to its own stem cells
A US team discovers the "home" of stem cells in the heart, lending credence to the idea that the heart has the capacity to repair itself
AND FINALLY ...
This week's Feedback column features DVDs with 15 minutes of annoying extras, revisits the secret genesis of teaspoons, and is asked out on a non-existent date...MORE