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Above: Click to watch the interview with Bob Rubin Sustenance at conventions is not always easy to come by. & So the conventional wisdom is to eat when…

Critics have long derided the world's biggest cities as disorderly, overcrowded and polluted. But in recent years, as the planet's population continues to rise past seven billion and more and more people flock to urban areas, some now argue that cities may hold the key to sustainable growth.

To keep the overhaul bill under President Obama's $900 spending limit, subsidies for middle-class families were reduced. So to prevent those families who can't afford insurance from being punished, proposed penalties were dramatically cut. That, insurance officials say, could backfire in a big way.

Among those blamed by the government for ethnic violence in China's far west is Uighur economist Ilham Tohti. He says the government accepts many of his suggestions on ethnic policy, but still doesn't trust him. He has been arrested four times, though never charged with a crime.

New York plans to offer $14,600 in housing subsidies to lure math, science and special-education teachers to the city. It's the latest tool that several public school districts -- in this case the nation's largest -- hope will attract good teachers to expensive housing markets.

Studies show that testing women in their 40s could save a small percentage of lives. But to some public health officials, it isn't worth the possible harm the excess testing causes. Cancer survivors and advocacy groups say the screening tool isn't perfect, but it's worth the risk.

Former Vice President Al Gore took the issue of global climate change to Capitol Hill on Wednesday. He addressed the Senate Foreign Relations Committee. Host Alex Cohen takes a look at the proceedings.

The 2009 Nobel Prize in Physiology or Medicine has been awarded to Americans Elizabeth Blackburn, Carol Greider and Jack Szostak, who made key discoveries about how living cells age.

The Phoenix Mars Lander has safely landed on the Red Planet. But getting there is only half the battle. The probe landed in Mars' northern polar region, an area believed to hold a reservoir of ice beneath the surface.

A San Diego teenager has won the Siemens Westinghouse Competition, a national contest in math and science. Sixteen year old Michael Viscardi will take home a 100-thousand dollar college scholarship.