Tropical Storm Isaac is expected to strengthen into a hurricane as it churns through the warm waters of the Gulf of Mexico. While its exact track is still uncertain, parts of Florida are being hit by the storms outer bands. Mississippi, Alabama and Louisiana are preparing as well.

Republicans have decided to delay the official start of their presidential nominating convention until Tuesday. Tropical Storm Isaac is causing weather-related issues around Tampa, Florida. As the convention is about to begin, polls show GOP presidential candidate Mitt Romney is tied with President Obama.

Neil Armstrong, the first man to walk on the moon, died over the weekend at the age of 82. Steve Inskeep talks to Neil Degrasse Tyson, director of the Hayden Planetarium in New York, about Armstrong's impact on space exploration.

The Republican National Convention will come to order at 2 p.m. in Tampa, Fla., and then quickly go into recess. Because of Tropical Storm Isaac, the main events have been delayed until Tuesday. This is the second convention in a row where the GOP had to delay the opening because of bad weather.

John Walker Lindh was a middle-class kid in Northern California who converted to Islam and went to travel the world. U.S. authorities eventually captured him in Afghanistan after Sept. 11, when he was allegedly fighting alongside the Taliban.

His story was the focus of a Law and Order episode, and a song called "John Walker's Blues" by Steve Earle.

For the past five years, Lindh has been living in a secret prison facility in Indiana with convicted terrorists, neo-Nazis and other inmates who get special monitoring.

Sixteen members of an Ohio Amish sect are set to go on trial in federal court Monday in Cleveland. The defendants are accused of violating U.S. hate crime laws by cutting the hair and beards of detractors, a humiliating reprimand for the devout.

Chin hair, according to Jacob Troyer, an Amish craftsman in Holmes County, Ohio, is a rite of passage for young Amish men.

"When they join church to get baptized, they grow a beard up to the bottom of the ear. They usually have an inch or so of space there. When they marry, they grow that together," Troyer says.

Republican presidential candidate Mitt Romney says he favors keeping all of the Bush-era tax cuts and then adding some more. To pay for these cuts, he would reduce or eliminate some of the tax deductions that many Americans have come to rely on. But his proposals are already facing a lot of resistance.

As we age, our sleep patterns change. We've all heard the complaints: "I wake up in the middle of the night and can't get back to sleep!"

Some sleep experts estimate that as many as 40 percent of older adults suffer sleeping problems such as sleep apnea and insomnia. Now, researchers have found a link between disrupted sleep and cognitive decline.