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Microbes may once have happily existed on the surface of Mars, according to chemical analysis of a sedimentary rock in the Red Planet's Gale crater. NASA geologist and exobiologist David Blake discusses evidence for an ancient freshwater lake in the crater, and describes the mineral-chomping microbes that may have thrived there.

Kathy Reichs, the writer and scientist behind the TV show Bones, is back with a new novel for young adults. Code: A Virals Novel stars Tory Brennan, great-niece of Reich's famed crime-solving heroine Tempe Brennan. Reichs discusses the book, co-written with Brendan Reichs.

Suffering a single concussion may cause lasting brain damage, researchers report in the journal Radiology. Steven Flanagan, co-director of the Concussion Center at NYU Langone Medical Center, discusses the findings, and why diagnosing a concussion is so difficult.

Conservative leaders and activists are gathering in Washington this week for CPAC — the Conservative Political Action Conference. There's been a lot of focus on who was invited to speak — like Mitt Romney and Donald Trump — and who wasn't, like Chris Christie. Plus, President Obama is heading to the Middle East for the first time as president next week. Host Michel Martin talks politics with Mary Kate Cary of U.S. News and World Report, and former Obama administration advisor Corey Ealons.

Jeb Bush is popular in conservative circles and is the third member of the Bush family to be seen as a presidential contender. (The last two were elected.) So is there some sort of How to Be President checklist somewhere in the Bush house? If so, it might look something like this.

French researchers confirm that the immune systems of 14 adults are apparently controlling HIV without medication. It's further evidence that early treatment may prevent the virus from establishing "reservoirs" of HIV-infected cells in the body.

The NHL will shuffle its teams before next season, moving from three divisions in both the Eastern and Western Conferences to a total of four divisions. The league's owners approved the plan Thursday; the players' association gave its OK last week.

Researchers say the war will cost the U.S. $2.2 trillion, a figure that far exceeds the original government estimate of $50 to $60 billion. If you factor in borrowing costs, the U.S. will end up paying nearly $4 trillion for the invasion.

The comet's now putting on a show in the Northern Hemisphere's night sky. Using its orbiting observatories, NASA captured a stereo view from space that offers a unique perspective.

With the support of the Texas Attorney General Greg Abbott, a state lawmaker has filed a bill that would block pending federal assault weapons ban from…