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There are few more sybaritic pleasures than scratching an itch.

But according to a study just out in the British Journal of Dermatology, the intensity of the scratching delight varies with the location of the itch.

It's not that the panicked Republican establishment needed more fodder for its attack on GOP presidential candidate Newt Gingrich as the wrong man to take on President Obama this fall.

They've managed quite nicely themselves over the past few days, piling on the pugnacious former House speaker, circa mid-1990s, in direct proportion to Gingrich's rise in the polls in Florida and nationwide.

We've been hearing it would happen for quite a while, so keep that in mind when you read this scoop. The Wall Street Journal says:

"Facebook Inc. could file papers for an initial public offering as early as next week and is currently looking at a deal that would value the social network between $75 billion to $100 billion, said people familiar with the matter."

Robert Siegel speaks with our regular political commentators, E.J. Dionne of the Washington Post and Brookings Institution and David Brooks of the New York Times.

Colton Harris-Moore, who gained international fame for being the so-called Barefoot Bandit, was just sentenced by a federal judge to 6 1/2 years in prison.

But since the time is to be served while he finishes out the 7 years in prison that he was sentenced to by a state court last December, it looks like Harris-Moore won't actually be spending any additional time behind bars.

The Associated Press reminds us that in 2010:

Research already demonstrates that physicians are sometimes uncomfortable talking about weight with their obese patients. Now, a new study shows that the doctors' weight makes a difference too.

Physicians who pack on the pounds discuss weight loss less frequently with obese patients than doctors who have normal body mass indexes (18 percent versus 30 percent), according to the report published this week in the medical journal Obesity.

One of the more dramatic moments in Thursday night's Republican presidential debate was when Mitt Romney said it was "repulsive" of Newt Gingrich to suggest that Romney was the most "anti-immigrant" candidate among the GOP contenders.

Fitch Ratings announced it was cutting the ratings of Italy, Spain, Belgium, Slovenia, and Cyprus.

Italy and Spain, two of the biggest eurozone economies, suffered a two-notch drop. Italy went from A+ to A- and Spain went from A to AA-.

Bloomberg reports:

If winter has you daydreaming of a vacation to sunny lands, you might want to consider the risk of dengue fever in your plans.

The number of cases of the disease, a severe flu-like illness with excruciating headaches, joint and muscle pain, is soaring, according to an update from the World Health Organization.

Now more than 40 percent of the world's population is at risk — 2.5 billion people, according to the group. In 2010, there were 1.6 million cases in the Americas alone.

This week solar flares sent a huge blast of X-rays and charged particles screaming towards the Earth. Solar astronomer David Hathaway and physicist Doug Biesecker discuss the sun's explosive behavior, and how that 'space weather' affects satellites, airplanes and the electric grid.

Transcript

IRA FLATOW, HOST:

Time now for our Video Pick of the Week. Flora Lichtman, our multimedia editor is here. Hi, Flora.

FLORA LICHTMAN, BYLINE: Hi, Ira.

FLATOW: Good video as always.

(SOUNDBITE OF LAUGHTER)

LICHTMAN: Yeah. This one is about something that I encounter every day, and I think of it as little more than a beverage cooler or maybe a nuisance on my commute to work. I'm talking about ice. But it turns out that ice was way more interesting than I knew before (unintelligible)...

(SOUNDBITE OF LAUGHTER)

Transcript

IRA FLATOW, HOST:

This is SCIENCE FRIDAY. I'm Ira Flatow. Stem cell therapy, it seems, is always promising, promising to cure diseases or illnesses. And this week, a study using embryonic stem cells has increased the hope of fulfilling some of those promises.

A 33,000-year-old skull of a "wolf on the way to becoming a dog" was found in a Siberian cave. Evolutionary Biologist Susan Crockford, co-author of a study about the skull in PLoS ONE, discusses why the discovery challenges common beliefs about dog domestication.

Transcript

IRA FLATOW, HOST:

This is SCIENCE FRIDAY. I'm Ira Flatow. After the Deepwater Horizon spill, BP poured nearly two million gallons of dispersants into the Gulf of Mexico. The goal, of course, is breaking up oil slicks, making them dissolve into ocean waters, sort of like how you squirt dish soap on a greasy frying pan to get the oil to wash away with the water.