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Reporting in the Astrophysical Journal, scientists write of a massive collision between two galaxy clusters. By studying the cosmic remnants of that smashup, they say leftover dark matter isn't behaving as current theory predicts. Astrophysicist Andisheh Mahdavi discusses this dark matter mystery.

Reporting in Nature, researchers write they have deciphered the genetic code of the gorilla, the last of the great apes to have its genome sequenced. Study co-author Aylwyn Scally discusses what the data reveal about the evolution of humans and other apes.

An analysis of votes shows bipartisanship has basically disappeared.

Reporting in Cell Metabolism, researchers write that when people who lead relatively sedentary lives worked out the DNA in their muscle fibers changed almost immediately. Scientists also found caffeine had the same effect on isolated rodent muscles. Study co-author Juleen Zierath discusses the DNA modifications.

More than 70 members of the NATO coalition have been killed by men in Afghan police or army uniforms in the last five years. After several recent attacks, new measures are being put in place.

This week while running in the Iditarod dog sled race, Scott Janssen's 9-year-old husky Marshall collapsed. He looked to be dead. But Janssen saved the dog, who now seems to be good as new. The funeral director isn't used to doing that kind of thing.

Burhan Ghalioun says he fears Annan's visit will only amount to pointless mediation, while Syrian civilians continue to be killed.

A year after the earthquake and tsunami that killed almost 20,000 people in northeast Japan, schoolchildren are moving on, but have not forgotten. The students and their teachers talk about the effect the quake and its aftermath has had on them.

The social media campaign by Invisible Children has drawn some 60 million viewers, many of them teenagers, to a video about a mass murderer in Africa. It will be closely studied by other nonprofit groups hoping to gain attention for their cause. Lesson one: It took years to lay the groundwork.

Newt Gingrich will campaign throughout Alabama on Saturday. Ron Paul and Rick Santorum will spend the day in Missouri and Kansas. Mitt Romney has no public events scheduled.