A chimpanzee which got hooked on smoking by visitors offering it cigarettes has died at a South African zoo at the relatively advanced age of 52, officials said yesterday. "He appears to have died of old age," said Qondile Khedama, a municipal spokesman.

Larry Summers, the Clinton-era treasury secretary who returned to government as Barack Obama's chief economic adviser, is to leave the administration before the end of the year.

What does he have to say for himself?

Our experts tackle the questions that are perplexing readers

It is reducing the glory of human knowledge to the memorising of correct techniques

Runners without shoes land more gently on the ground, avoiding impact injuries

South Africa's former health minister Manto Tshabalala-Msimang, known as "Dr Beetroot" after her dogged promotion of the vegetable, along with lemons, garlic and olive oil to treat Aids, has died aged 69.

Young women who suffer from migraines with visual disturbances and who smoke and take the contraceptive pill are at a higher risk of stroke, research suggests.

From belief in God to the irresistible urge to flirt with the opposite sex, there are some human impulses that even the biggest brains in psychology are unable to explain. Here are their greatest unanswered questions

The first test was to get the scholarship, the second to be initiated into the fraternity, and the third to take the degree summa cum laude. But now there is a fourth test any complete Harvard alumnus must pass: the wardrobe. Strapped for cash – because of poor returns on investments, thanks in part, no doubt, to those high-fliers who went into Wall Street – Harvard University has commissioned a clothing line, summed up in that all-American adjective "preppy". There will be button-down shirts, sports jackets with crimson button-holes, and plaid with everything, all at a very pre-crash, Gordon Gekko, price.

For years, the university has been striving to shed its highbrow image. But a new clothing range may undo the hard work

Thousands returned within a few years of crossing the Atlantic, academic reveals

Robots wag their tail fins and bob along like bathtub toys in a pool at a New York state college lab. Their actions are dictated by microprocessors housed in round plastic containers, the sort you'd store soup in.

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