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Nearly 10,000 trees in New York City — many healthy and hefty — were lost to the winds of Superstorm Sandy. Natural scenery aside, they affect the environmental quality of the city.

Many Afghans are wondering about the timing and motive of Pakistan's release last week of at least nine Taliban prisoners. They say mistrust born of decades of duplicity won't vanish with a few declarations or small gestures.

Two Republican governors announced Thursday afternoon that they would not create exchanges in their states. A Democratic governor chose a hybrid model for her state. Then, the federal government pushed back the states' decision deadline, again.

More rockets were fired at Israel from Hamas-controlled territory. Sirens are blaring in Jerusalem. Meanwhile, Israel has aimed airstrikes at more targets in Gaza. And Egypt's prime minister, on a visit to Gaza, said his country would "spare no effort ... to stop the aggression."

Given the pressure of evolution, why have genes behind schizophrenia, autism and others disorders persisted? A study that looks at the likelihood someone is to have kids tries to figure it out.

City planner Jeff Speck says walking will remain a choice in most American cities for years to come, but that it's important to incentivize pedestrians. In his book, Walkable City, Speck says urban walks have to be useful, safe, comfortable and interesting.

Debate over the so-called fiscal cliff has dominated the post-election agenda. But the challenge of dealing with long-term debt and the annual deficit has been brewing for years. And one man who has kept his focus and money on that target is the billionaire Peter G. Peterson.

Secretary of State Hillary Clinton arrives in the region Tuesday. And in Cairo, Egypt's new Islamic leadership is now serving as a mediator between the Israelis and Gaza's Hamas-led government.

Now that the Supreme Court has found the Affordable Care Act constitutional and the president's re-election made clear that big chunks of the law will take effect in 2014, the administration is finally releasing rules of the road that states and insurance companies have been clamoring for.

Native Americans used fire to manage rangeland for thousands of years, but a 100-year burning hiatus followed settlement by Europeans of the North…