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Boisjoly was the engineer who boisterously warned about problems with the Challenger's elastic seals. That he couldn't do anything about the launch haunted him and turned him into a crusader for ethics in engineering. Boisjoly died at age 73.

At a rally in Centennial, Colo., GOP presidential front-runner Mitt Romney rolled out some new material: the rights given to people by God.

Opposition leaders have coalesced into a united and focused movement that is preparing to choose one candidate to run against the president, posing the strongest electoral challenge to Hugo Chavez's populist rule. Chavez still leads his nearest rival, but the gap is nothing like in years past.

Tired of tuition increases within the cash-strapped University of California system, a group of students has suggested eliminating tuition entirely. Instead, they propose that graduates pay the system a percentage of their income over the subsequent 20 years.

China used to require western banks to co-brand with Chinese operators. But now Citi can sell its own plastic, just as credit cards become more popular. Rising incomes are boosting consumer spending.

Activists say dozens of people were killed in the Syrian town of Homs Monday when government troops opened fire with tanks and machine guns. More than a dozen others were killed elsewhere. Renee Montagne talks to Omar Shakir, an activist in Homs, who's been posting updates on Twitter.

Greek leaders are supposed to meet again Tuesday to finally sign off on more painful austerity measures in exchange for a new bailout. Greece needs more loans — and a separate debt-reduction deal — to avoid a messy default, which could lead to an exit from the eurozone.

Minnesota holds non-binding GOP caucuses Tuesday. Newt Gingrich, Rick Santorum and Ron Paul all campaigned in the state Monday. Each of front-runner Mitt Romney's rivals is looking at the state as a place where they can regain their footing.

"We are asking for [an] SOS," says blogger and citizen journalist Omar Shakir from inside Homs, as heavy machine gun fire echoes in the background. He and others in the city say government forces continue to kill people there.

Contests in Iowa and Nevada have been plagued by embarrassing snafus. As Minnesota and Colorado head to their caucuses Tuesday, we look at why some states still bother with this primitive but uniquely American way of picking a president.