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For girls, extra pounds equals early puberty

Obese young girls develop breasts and menstruate earlier — sometimes by age nine — a Michigan study found. Doctors lack consensus on body weight's role in triggering puberty, but believe aggravated hormone production and lack of exercise might contribute.

- AB

And you think you have data overload

Every way you count it — think the capacity of 2 billion iPods — it's huge. Researchers say the world generated 161 billion gigs of information last year. If storage can keep up, the data explosion will reach a zettabyte by 2010.

- CN