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Colorado's vote to approve recreational use of marijuana also legalized its relative hemp, which is grown for food and other everyday uses, not for its high. Large-scale commercial farmers may be in line to benefit, but growing hemp is still illegal under federal law.

To understand how social rules affect the interactions between humans and machines, scientists re-created a famous psychology experiment using robots. What they found is that if robots are nice to us, we're nice to them. If they're not, we "punish" them.

An immigration plan announced Monday by a bipartisan group of senators would create a path to citizenship for illegal immigrants already in the country and overhaul legal immigration. It also calls for improved border security and better tracking of individuals in the U.S. on visas. Steve Inskeep talks with one of the senators behind the plan, Republican Jeff Flake from Arizona.

In a long interview about many subjects, the president told The New Republic that he's been skeet shooting at Camp David. Rep. Marsha Blackburn, R-Tenn., wonders "why have we not seen photos?" She thinks she should get to shoot with the president. "I bet I'll beat him," Blackburn tells CNN.

A house in Oklahoma City has been dubbed "the twin house" after a third consecutive couple living there had twins. The current tenants said they didn't believe in the twin mojo when they moved in.

News reports about a parent of a child killed at Sandy Hook Elementary School being "heckled" by gun owners aren't necessarily supported by video of the incident. Watch and judge for yourself.

Though there have been other signs to indicate that the economy is on the upswing, many Americans aren't feeling all that good about how things are going.The private Conference Board reports that its widely watched consumer confidence index fell to 58.6 in January from 66.7 in December.

If there's a settlement or judgment against another party in a liability case, Medicare is entitled to reimbursement for the money it spent on a beneficiary's medical care. The process is complex and prone to delays. A new law is expected to fix the problems.

A significant number of American workers are dipping into their retirement accounts to help pay for everyday expenses, despite warnings that it could seriously compromise their financial health. Host Michel Martin speaks with Washington Post reporter Michael Fletcher about the consequences of tapping retirement funds early.

When people refer to the ends of the earth, they invariably mention Timbuktu. The fabled West African city on the cusp of the Sahara has a mystique that has lasted for centuries.