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The string of genes that make a man a man used to be much bigger, and some geneticists say it may be wasting away. Back off, others say. Y has been stable — and crucial — for millennia.

Giving Capitol tours to constituents is a primary duty of Hill interns. They provide a great deal of information, but sometimes they're a little short on actual history.

NASA's Opportunity Mars rover set a record Monday for driving a longer distance than any other manmade craft sent to another celestial body.

Firefighters are making good progress on a number of destructive wildfires burning in the West. In Washington, fire crews are hoping to contain the largest fire in that state's history within the next week.

Zillow has agreed to buy Trulia for $3.5 billion in stock. The two websites represent more than 60 percent of the total Internet traffic for real estate listings.

Benjamin Netanyahu called the operation in Gaza justified and asked Israeli citizens to prepare for a long conflict.

The White House says the cost of inaction outweighs the cost of implementing more-stringent regulations on greenhouse gas emissions.

Sure, they talk about boys. But mainly they talk about girls — and how to bring better education, health care and other opportunities to their sisters in poor and sometimes prejudicial countries.

Hotels are happy to charge you $300 a night for a stay, but their Wi-Fi speeds are often too slow to stream a movie. Now, two competing sites are trying to solve the problem.

That strong, sturdy handshake your grandpa taught you isn't the cleanest way to greet someone, scientists say. So should doctors and nurses in hospitals start bumping fists?