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A graduate student working on a class project spotted the coils, which hint that Mars had recent volcanic activity.

What was a farmer with Mediterranean roots doing in Sweden 5,000 years ago? Bringing farming north to the hunter-gatherers, according to new DNA research.

The state is one of just a few that is expanding Medicaid ahead of a major expansion called for in 2014 by the federal health law. Though the state estimates that 50,000 people meet the income bar, Colorado will only be able to offer coverage to 10,000 people.

Melissa Block talks to Larry Israelson about his 39 year late apology to his 7th grade teacher. When he was 12 years old, he did something he only later realized probably hurt his teacher. It was minor but in time, when he was older and wiser, he wanted to find his teacher and apologize.

The U.S. Supreme Court heard arguments this week on a controversial Arizona law. The law is intended to deter illegal immigration by requiring local law enforcement to get involved. If police have a reasonable suspicion that someone is in the country illegally, the law requires them to determine immigration status. Melissa Block talks with Tucson Police Chief Roberto Villasenor about the implications for his department should the Supreme Court uphold the law.

The New Yorker started a tongue-in-cheek contest last week to purge the worst word from the English language. Some of the submissions were words that are "like" overused. Others had "bad textures."

The Senate Finance committee has voted unanimously to recommend banning a so-called “internet tax”. The bill would clear up the confusion surrounding the…

The Pentagon set up special battalions to help returning troops recover from their battlefield wounds. But some of those soldiers have been given excessive amounts of prescription drugs, which are causing additional problems.

The romantic comedy The Five-Year Engagement reunites writer-director Nicholas Stoller and Jason Segel, who made Forgetting Sarah Marshall and The Muppets together. This time, Segel and Emily Blunt play a couple whose relationship is tested by a major relocation.

Some 10,000 African immigrants, many of them traders, have taken over a neighborhood in southern China. It's a hard life, but it reflects the dramatic increase in commerce between Africa and China.