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Itch can be a useful warning sign, or a maddening symptom with no cure. But the origins of itch have long been a mystery. Scientists think they've come closer to understanding the origins of itch in a molecule that makes mice scratch like mad.

There is some political willingness, but because China is highly decentralized politically, the Communist Party has only limited influence over provincial governments and how they regulate their dirty factories. The powerful state-owned oil companies have also resisted pressure to produce cleaner-burning fuel.

The drivers were told no more shorts, even though the heat in the cabs can top 95 degrees. They are permitted to wear just long pants or skirts. So many of the male engineers are now wearing skirts.

The Iranian presidential election is just weeks away, and voters are faced with a very narrow range of pro-regime candidates to choose from. All the high-profile or independent candidates have been eliminated by the Guardian Council. One man considered unfit to run has already held the post of president.

City life can be harsh on people. For example, it pushes people to work longer and sleep less. A new study suggests that city life can have a somewhat similar effect on birds too. It shows urban blackbirds wake up earlier and go to bed later than their forest dwelling cousins.

The high crime rate throughout Latin America has many causes. In many countries, residents claim that police and security force members are part of the problem. In Venezuela, one family says the police are linked to multiple killings that have devastated the family.

President Obama discussed America's counter-terrorism strategy — including the use of drones and the prison at Guantanamo Bay — during an address at the National Defense University on Thursday. He rejected the idea that the country can fight an open-ended "global war on terror."

The Guardian newspaper says the insider who blew the whistle on the NSA's probing of major U.S. Internet and telecom companies is a 29-year-old analyst who's been working for the agency under a government contract. His name is Edward Snowden.

Sheriff's deputies on patrol in the Florida Keys spotted a deer on the side of a road with an empty bag of Doritos stuck on its head. "It must have wanted the last chip in the bottom," a deputy told the South Florida Sun Sentinel.

Three people are thought to have parachuted off of the building.