NPR Staff

A couple years ago, artist and illustrator Christoph Niemann felt like he needed to shake things up. "When you do any kind of creative job for a while, you become better ..." he says, "but I think you always become a little bit more predictable."

Long ago, electronic music was created on massive consoles the size of refrigerators. But in 1970, the Minimoog Model D was unleashed, and its impact was nothing short of revolutionary.

Thousands will pack into the Staples Center in Los Angeles this weekend for a championship final event. It's not an uncommon scene for the center as it's home to the Los Angeles Lakers, but this weekend it's not the Lakers who are taking center court.

Along the border between the U.S. and Mexico, armed groups on patrol — mostly men — look for illegal immigrants and drug traffickers. They're not U.S. Border Patrol, but regular people who've decided to take matters into their own hands.

They call themselves militias. Groups such as these have been around for decades, but they exploded in number after Barack Obama was elected president. Today, there are 276 militia groups around the country, according to the Southern Poverty Law Center.

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