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Also: Amazon launches a comics imprint; Reed Johnson on an uncrackable medieval code; a Colorado state Senate candidate writes erotica.

The George Zimmerman trial is expected to wrap up this week. Zimmerman shot and killed teenager Trayvon Martin last year in what he said was self-defense. Host Michel Martin checks in with Orlando Sentinel reporter Rene Stutzman about her view from inside the courtroom.

Not so long ago, Virginia Gov. Bob McDonnell was one of the GOP's hottest national prospects. Now it appears his political career has crashed and burned.

Launched last year in Southern California, the network is going on DirecTV starting in August. Its programming aims to entertain dogs when their owners are out of the house.

When members of a choir sing, their heart rates quickly become synchronized, beating in the same rhythm. Researchers think this may be why singing together is a key part of religious rituals around the world, and such a joy for the singers.

Russia is preparing for the 2014 Winter Games — turning a sleepy valley in the Northern Caucasus Mountains into an Olympic village, with brand-new facilities for every Alpine sport. Officials say it will be a world-class destination for winter-sports enthusiasts long after the Games are over. Environmentalists say it's an ecological disaster in the making.

The defense is expected to finish its closing argument on Friday. Then, Judge Debra Nelson will instruct the jurors on what they are to consider as they weigh whether George Zimmerman acted in self defense or should be sent to prison for the shooting death of Florida teenager Trayvon Martin.

"I certainly would have thought a lot more about what I said," Justin Carter told CNN's New Day on Friday. He'd been held since February, with bail set at $500,000, because of a posting that referred to a school shooting. An anonymous donor came forward to bail him out.

After reports that he has sexually harassed numerous women, Mayor Bob Filner released a video statement in which he apologizes but does not talk about stepping down. The 70-year-old Democrat has only been in office about 6 months.

Social media guru Clay Shirky discusses how our small individual contributions to the web, can collectively help build a better, more cooperative world.