Last night in a press conference, Florida state special prosecutor Angela Corey announced the charges filed against George Zimmerman for the shooting death of Trayvon Martin on February 26. Zimmerman was arrested yesterday on charges of second degree murder. Adam Kaeloha Causey, a reporter with the Florida Times Union, attended last night's press conference. Dale Carson is a lawyer and retired legal instructor for the FBI, and joins us to discuss the legal explanation behind Zimmerman's arrest.

Yesterday the U.S. Department of Justice sued Apple and five major publishers on antitrust grounds, alleging they fixed prices of e-books throughout 2010. According to the Department, consumers may have been paying as much as $5 too much for e-books. Three of the publishers have settled. Joe Nocera is an Op-Ed Columnist at the New York Times, and joins us to talk about how book pricing works, and what yesterday's legal actions mean for the future pricing of e-books.

Although violent crime has decreased across the country, for one group, the numbers seem to tell a different story. According to statistics compiled by the FBI, the number of police officers killed in 2011 was up by 25 percent from the previous year — and up by 75 percent from 2008. A total of 72 officers were killed in 2011. And for the first time, last year more officers were killed by suspects than by car accidents. Why are more officers losing their lives on the job? Maria Haberfeld, chair of the Department of Law, Police Science, and Criminal Justice Administration at John Jay College of Criminal Justice says that while it's hard to pinpoint any one factor behind these numbers, there are some trends that emerge when the statistics are examined closely.

The NHL playoffs started last night, and for many of these professional athletes that means growing a "playoff beard." A tradition in hockey that goes back three decades, the playoff beard is for both players and fans who refuse to shave during the post-season. This superstition has spread to other professional sports as well, and got us wondering: what other superstitions do professional sports players have? And what superstitions do you have while watching your favorite team?

E.O. Wilson, the biologist, theorist, and sometimes-novelist, has pioneered entire fields of study in his six-decade career. Back in 1975, Wilson popularized the theory of sociobiology: the idea that evolution and genetics shape human behavior. Wilson’s new book, "The Social Conquest of Earth" tackles this subject and through one simple question: how did altruism evolve in species like human and ants, when so few species are altruistic?

It has been 46 days since 17-year-old Trayvon Martin was shot and killed in Sanford, Florida, yet it will be months before there is any resolution in the case. Although second degree murder charges have been filed against the man who admits to shooting Trayvon, but it could be eight months or more before a jury is convened and the trial begins. What happens in the meantime? Valerie Houston is a Pastor at Allen Chapel AME Church in Sanford, Florida, and Farai Chideya is a journalist and blogger at Farai.com.

He may no longer be making headlines or dropping one-liners at the debates, but former GOP front-runner Herman Cain is still an active presence in the Republican Party. The "Hermanator" spoke last night at an event sponsored by the Columbia University College Republicans. Stephen Reader, contributor to It's A Free Country, spoke with the GOP star about his campaign, the remaining Republican field, and his series of controversial YouTube videos.

A ceasefire has come into force in Syria amid doubts expressed by Western countries about the government's willingness to stick to it. Correspondents say the truce appears to be largely holding, with no reports of casualties or deaths so far. The Syrian government and the armed opposition have both said they will abide by the ceasefire, but reserved the right to respond if attacked. We are joined by Ausama Monajed of the Syrian National Council.

This year, hundreds of thousands of Americans will travel abroad, not to see ancient ruins or visit historic sites, but to undergo affordable medical care. These medical tourists will go to Mexico, Thailand, Costa Rica and elsewhere for everything from root canals to hip replacements. And while this type of tourism has been around for decades, it’s become more and more popular as health-care costs in the U.S. continue to rise. Paul Vehorn is a behavioral psychologist who’s visited Thailand for two different procedures, and James Surowiecki is a journalist with the New Yorker who explores what the bigger economic implications of medical tourism might be in his article entitled “Club Med.”

Last night at 6pm, Florida state special prosecutor Angela Corey announced that George Zimmerman had been charged with second degree murder in the Trayvon Martin case.

In addition to stating the charges, she also announced that George Zimmerman was in state custody, and responded to questions from the journalists.

Among the journalists there was Adam Kealoha Causey, a reporter with the Florida Times Union.

And offering a legal interpretation on last night’s press conference is Dale Carson, a lawyer, retired legal instructor for the FBI, and a former police officer.