On the Record

Sometimes you don't really trust men to pick out things you'll want to wear — I was very pleasantly surprised.

Harvard Medical School's Laura Mariani after her boyfriend bought her some molecule-shaped earrings (one serotonin, one dopamine) from jewellery company Made With Molecules. One to consider if you messed up on Valentine's Day.

Scorecard

Credit: G. BROWN/CORBIS

Siestas

Regular midday naps cut the risk of a death from heart disease by up to 64%, says a study of Greek men. The effect was strongest in those with jobs, highlighting the stress-busting power of a nice nap.

Science books

Ten years ago, Britain's most popular non-fiction library book was Stephen Hawking's seminal A Brief History of Time. Now it's You Are What You Eat, a dieting tome by the widely criticized 'holistic nutritionist' Gillian McKeith.

Number crunch

90% is the degree of certainty that global warming is being caused by human activity, according to the Intergovernmental Panel on Climate Change's fourth assessment report.

95% of Democrats who responded to a limited poll of both parties in Congress said they believed that it has been proved beyond reasonable doubt that human activities are warming the planet.

13% is the proportion of Republicans who responded who share that view.

Sources: Archives of Internal Medicine, BBC, IPCC, The Scientist