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Photographer Bill O'Leary's big break came the night Washington, D.C.'s mayor was arrested during an FBI sting. O'Leary, an intern for The Washington Post, was in the right place at the right time.

Some of the earliest science fiction imagined voyages to Mars. We now have the space-faring technology to make reaching the Red Planet possible. It would involve massive resources and many potential dangers, but some believe the rewards would be massive.

Dr. Ola Orekunrin's dream of creating an air ambulance service in Nigeria was dismissed by many experts as impossible. But the young doctor and helicopter pilot refused to give up. Dr. Orekunrin tells host Michel Martin what it took to set up Flying Doctors Nigeria. This segment originally aired Dec. 5, 2013 on Tell Me More.

According to a National Science Foundation study, only five percent of scientists and engineers in the U.S. are African-American. Host Michel Martin speaks with Freeman Hrabowski, president of the University of Maryland, Baltimore County about the challenges blacks face in the tech world. They're joined by Silicon Valley techie Ayori Selassie and digital lifestyle expert Mario Armstrong. This segment originally aired Nov. 27, 2013 on Tell Me More.

As many as 15 percent of babies have colic, which can cause bouts of inconsolable crying. Researchers are testing probiotics to see if these good bacteria can help. But they don't know how the supplements work, or how they may affect children's health long term.

President Obama has a couple tools at his disposal that let him bypass congressional approval — and he's using them to advance his economic agenda. The administration says the president is still willing to work with Congress, but some on Capitol Hill are taking issue with the executive tactic.

Three-time Olympic skier Kris Freeman has had a successful career filled with challenges; first and foremost managing diabetes while becoming an elite competitor in a physically taxing sport. But this past year, Freeman encountered another obstacle when his relationship with the national ski team abruptly ended.

Attacks on undocumented day workers have frustrated police agencies for years. Workers carry wads of cash and rarely report the crimes. In a controversial move, some banks have been stepping in to help some of the workers open bank accounts to make them less of a target.

The U.S. Department of Agriculture says the infrastructure for local food is lacking but growing fast. "Food hubs respond to that call," one official says.

Inspectors from the International Atomic Energy Agency report that Tehran has halted the highest level of uranium enrichment, a key part of the sanctions deal reached earlier this month.