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Using a few simple factors, Dartmouth professor Andrew Bernard can guess, with a high degree of accuracy, how many medals countries will win at the Beijing Olympics. Bernard talks with Renee Montagne about his economic model for predicting the medal count.

Mexico has one of the lowest rates of HIV infections in Latin America: 0.3 percent. It has taken root among people who live on the margins of society and are often discriminated against. The government is launching a campaign to reduce discrimination.

If you're among the people who make personal calls on a company mobile phone, the Internal Revenue Service may want to talk with you. The IRS considers such cell phone calls to be a taxable extension of your compensation package.

Lance Armstrong announced Tuesday that he will come out of retirement to try for an unprecedented eighth victory at the Tour de France.

In South Florida, Haitian-Americans and Cuban-Americans are mobilizing to help their friends and relatives back home. Conditions in Haiti make it hard to get aid to those who need it. Cuban-Americans face an embargo and restrictions of travel.

In New Hampshire, Democrat Jeanne Shaheen and Republican John Sununu are in a rematch of their 2002 race. Sununu won then, but so far this year's polls suggest the tide has turned. Josh Rogers, of New Hampshire Public Radio, says that since 2002, the state's GOP has imploded.

Finding a parking space in San Francisco can be about as easy as winning the lottery. Drivers are known to circle for 30 minutes or more searching for a spot, clogging up traffic and sometimes causing road rage incidents. But they soon may be able to use their Blackberries or cell phones to snag a spot.

President Bush, at a news conference in Rome Thursday, reiterated the need for a tough stand on Iran's nuclear program. Iran and Italy are major trading partners and the issue is a sticking point between Bush and his ally, Italian Prime minister Silvio Berlusconi.

The Colombian military has rescued hostages from left-wing FARC rebels. Marc Chernick, associate professor at Georgetown University, says though the rebels have been weakened, they can continue fighting the military for a long time.

Summertime means ceiling fans and lemonade, trips to Disneyland and a parade of recreational vehicles on the highways. But RV parks fill up fast, and travelers who can't find a spot for the night often head over to the local Wal-Mart parking lot. Call it a new version of camping in America.