While many of the world's top athletes have been training full time for the Beijing Olympics, one runner is doing it in his spare time. Reporter Todd Melby has the story of a sprinter who works at a junior high school in Minneapolis and is training to represent his native country, the Marshall Islands, in the Summer Games.

Olympic victory is often measured in fractions of a second. Competitors are always looking for an edge. Many turn to advanced technology to get that edge. Anchor Lisa Mullins gets an update from The World's Technology Correspondent, Clark Boyd.

Iran has launched a new crackdown on Iranian men sporting western hairstyles and women wearing "immodest" dress. Anchor Lisa Mullins speaks with the BBC's Pooneh Ghoddosi who's just returned from Iran.

President Bush was in London today. During a joint news conference with the British prime minister, Mr. Bush was asked if he backed the Afghan president's threat to send troops into Pakistan to battle militants there. The president had a cautious response. The World's Matthew Bell reports.

President Karzai

Afghan president Hamid Karzai has threatened to send troops into neighboring Pakistan. Karzai said he has the right to cross the border because militants from Pakistan have been making cross-border raids. Anchor Lisa Mullins gets more from The World's Quil Lawrence who's in Kabul.

Video: President Karzai's remarks

Today on the World: British Prime Minister Gordon Brown announces he'll send more troops to Afghanistan; Qatar's growing role as a behind-the-scenes negotiator in the Middle East; and the Marshall Islands' only male competitor for track and field in the Olympics is training at a junior high school in Minneapolis.