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In New Orleans today, one thing was made clear: Revelry doesn't stop for dark clouds. While the crowds were thinner than usual, many thought the weather was perfect for Fat Tuesday.

North Korea's latest nuclear weapons test is much more powerful than the previous two, according to estimates made by instruments that measure seismic waves from the blast. But it's hard to verify North Korea's claim that the test was of a miniaturized nuclear weapon.

Tuesday's State of the Union address marks the third anniversary of President Obama public criticism of the Supreme Court for its Citizens United ruling. It's also just over one year since he reversed course and embraced a superPAC for his own reelection. The Obama record on political money is one of ambivalence and flip-flops.

There were several key developments involving the U.S. military on Tuesday. President Obama was expected to announce in his State of the Union address that the U.S. will bring home 34,000 troops from Afghanistan by this time next year. That will cut the force in half. The Joint Chiefs of Staff also testified before Congress about where they would have to cut the force if across-the-board budget cuts, called sequestration, go into effect. Pentagon correspondent Tom Bowman talks to Melissa Block about the latest developments.

The U.N. Security Council strongly condemned North Korea's third nuclear test on Tuesday, and started discussions on further measures against Pyongyang. China joined in the condemnation, calling in the North Korean ambassador in Beijing to criticize his government's action. But whether China — North Korea's indispensable ally — will agree to tougher sanctions is an open question.

Obama used his fourth State of the Union address to set forth a sweeping vision for his second term. Obama said he would seek to reform entitlements, the tax code and immigration policy. He also offered a laundry list of smaller initiatives like raising the minimum wage and offering universal preschool.

After The New York Times published a scathing review of Tesla's Model S electric car, the automaker's CEO took to Twitter to slam the reporter. Disputed facts aside, the timing of the spat could hurt Tesla, which is under pressure to improve its financial performance.

Diclofenac — sold under the brand names Voltaren, Cambia, Cataflam and Zipsor — raises the risk of a heart attack by about 40 percent. But that hasn't prevented the drug from becoming the world's most popular painkiller in its class. Now researchers are calling on the World Health Organization to remove it from a list of so-called "essential medicines."

Last month, Brent Musburger was accused of being sexist when he gushed about "what a beautiful woman" Miss Alabama was during the BCS Championship game. Commentator Frank Deford says if Musburger was guilty of anything, it was failing to note what a cliche he was perpetuating.

John David, 73, is one of the many faces of a growing group of Americans: seniors who work. The former TV producer switched careers in his 50s, becoming a fitness instructor. "This turned out to be the real calling," he says.