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This week: the British import with some of the best hats on TV, and the question of how to get back a disgruntled audience.

In his new book Fat Chance: Beating the Odds Against Sugar, Processed Food, Obesity, and Disease, endocrinologist and obesity doc Robert Lustig deconstructs the mythology of fat. He says exercise, for all its benefits, won't help you shed pounds--and that fasting only worsens weight gain.

The flu season may be easing up in some parts of the country, but it's far too soon to let you guard down. The Centers for Disease Control and Prevention says influenza infections ebb and flow unpredictably.

The way bartenders shake their cocktails has practically evolved into their signature beats. Some shake hard, some shake over the shoulder, some shake in front. Most bartenders say the shake is essential to a perfect drink — but is it all style or is there some substance to the claim?

The announcement from Sen. Jay Rockefeller that he will not seek another term would seem to give Republicans a big opening in a state that went deep red in November. But West Virginia's animus toward President Obama doesn't necessarily translate into Republican advantages in statewide races.

Three years ago, a massive earthquake destroyed much of Haiti's capital city. Aid agencies from around the world pledged billions of dollars to help Haiti rebuild. But since then, many of the grand plans have fizzled, and some 350,000 Haitians still live in makeshift camps.

Melissa Block talks with science correspondent Richard Harris about Shell's troubled history in the Arctic.

A pair of prominent hedge fund managers have taken opposing positions on the nutritional-supplement company Herbalife. Bill Ackman of Pershing Square Capital Management says the multilevel-marketing company is a pyramid scheme and a bad investment. He's shorting the stock. Dan Loeb of hedge fund Third Point says Herbalife is a good investment. He's taken an 8.2 percent stake in the company and is betting that its shares will rise. Melissa Block talks with David Kestenbaum of the Planet Money team.

Afghan President Hamid Karzai and President Obama discussed future U.S.-Afghanistan relations and the withdrawal of U.S. forces on Friday.

A British police report released Friday found the late entertainer Jimmy Savile committed more than 200 sex crimes, "unprecedented in the UK." The report summarized a three-month investigation into charges against Savile, who died in 2011.