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The Brain's Calorie Counter
The current obesity epidemic has galvanised scientists into working out the biological ways in which we control our food intake. Geoff Watts examines new research into a so-called 鈥渃alorie counting鈥� area of the brain. Could this, rather than the taste of food, be the main reason why over the long term we get satisfaction from high calorie foods and why so may diets fail after just a few weeks?

The Able Prize for Maths
Mathematician Marcus Du Sautoy reports from Oslo on the announcement of this year's winner of the mathematical equivalent of the Nobel prize.

Shark Tagging
Tagging great white sharks is providing new insights into their elusive routes round the globe 鈥� knowledge that could help tighten conservation regulations of one of the ocean鈥檚 most endangered animals.

Transplanting Hearts
And a new approach to repairing hearts - Roger Laham at Harvard Medical School is pioneering a new technique; transplanting healthy heart tissue to the site of the attack in the same heart, which could transform long term outcomes for heart attack patients.