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Facebook begins selling stock to the public Friday in the most talked-about market debut in years. Two Associated Press business writers are debating whether the stock is a smart buy.

Facebook begins selling stock to the public Friday in the most talked-about market debut in years. Two Associated Press business writers are debating whether the stock is a smart buy.

A company started in a Harvard dorm room in 2004 has just raised $16 billion and is valued at $104 billion. All that from an initial public offering of stock.

Discovered: Kids brains look different than adults brains when exercising, how to make schools healthier and how thunderclouds are contributing to climate change. This is your child's brain on exercise. It looks different than your adult brain, finds research. When kids exercise they change the way their brains work. "In the last several years there have been data suggesting that neurobiological changes are happening -- [there are] very brain-specific mechanisms at work here," explains researcher David Bucci. ...

It's Facebook's big day.