The Iranian government today firmly rejected protestors' demands to re-do the presidential elections. We get an update on the situation from Scott Peterson, Middle East correspondent for the Christian Science Monitor who's been covering the story from Turkey after being expelled from Iran.

Investigators are trying to find out what caused yesterday's rush-hour train crash in Washington D.C., which killed 9 people. We get an update from Ian Urbina, who is covering the story for the New York Times.

As President Obama addresses healthcare during a white house press conference today, we take a look at how needless medical tests may affect healthcare costs.  Our guest is Dr. Richard Fried, director of the Kimberton Clinic for Sustainable Medicine and a longtime family physician in Chester County, Pennsylvania. Dr. Fried says he had one patient come to him after undergoing a number of expensive tests through specialists, for what he instantly saw was a harmless lump.

An older driver plows into a crosswalk and kills a toddler, or crashes into a building prompting state lawmakers to call for tougher driving requirements for seniors. It's a scenario that has played out in states nationwide, including here in Massachusetts recently.  Health & Science reporter Sacha Pfeiffer reports on reaction among elderly drivers, and takes a test simulating what an older driver experiences behind the wheel.

We also speak with Dr. Elizabeth Dugan, professor of gerontology at the University of Massachusetts Boston and author of "The Driving Dilemma."

We remember Ed McMahon, the loyal "Tonight Show" sidekick who bolstered boss Johnny Carson with guffaws and a resounding "H-e-e-e-e-e-ere's Johnny!" for 30 years. McMahon died early today at a Los Angeles hospital. He was 86. We also look back to an incident that occurred in Roswell, New Mexico in 1947. UFO watchers believe that a flying saucer with aliens on board landed outside the town and that an elaborate cover-up by authorities followed. The BBC's Kevin Connolly reports that the controversy is still going strong.