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In 2008, Democratic caucusgoers launched Barack Obama as a legitimate national contender, and voters later turned out in record numbers to put him in the White House. But now many of his past supporters are wary and worried, and he's locked in a dead-heat battle with GOP candidate Mitt Romney.

Fossils discovered in East Africa suggest that Homo erectus, the species believed to be humans' direct ancestor, may have shared Earth with two genetically distinct but similar species. Some paleontologists believe that these species may be distant relatives to modern humans, while others need more evidence.

Bolt becomes the first Olympian in history to successfully defend gold medals in the the 100 and 200 meter races.

The eurozone was supposed to create one big labor market by making it easy to cross borders for work.

The attack at a Sikh temple by a gunman with ties to white supremacists has raised questions about domestic terrorism — and what law enforcement is doing to stop it. In recent years, the Internet, the worsening economy and changing demographic patterns have given new voice to hate groups.

The London-based Standard Chartered Bank faces charges of laundering Iranian funds and violating U.S. sanctions against Tehran. The U.S. has laws in place regulating foreign assets, but how effective are they?

The U.S. Air Force's top officer, Gen. Norton Schwartz, is retiring after four years on the job. Schwartz was a champion of remotely piloted aircraft, or drones. But he says the Air Force will continue to need pilots for decades and more manned aircraft to ensure it can prevail with a minimum use of force.

Poet Mbali Vilakazi was inspired by a fellow South African, swimmer Natalie du Toit, who lost one of her legs at age 17 and is the first female amputee to qualify for the Olympic Games. "It's not about what happens to you, it's about how quickly you can get up," Vilakazi says.

A Senate panel found last year that Goldman Sachs marketed four sets of complex mortgage securities to banks and other investors, but failed to tell clients the securities were very risky. The Justice Department said the "burden of proof to bring a criminal case" could not be met.

Denny's Corp. is opening a flagship restaurant in downtown Las Vegas. It will take up 6,400 square feet and include a full bar and wedding chapel. And of course, it will be open 24-7.