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Generations of physicists have claimed that time is an illusion. But not all agree. In his book Time Reborn: From the Crisis in Physics to the Future of the Universe, theoretical physicist Lee Smolin argues that time exists--and he says time is key to understanding the evolution of the universe.

When it becomes legal to sell marijuana in the state, packages will have to be labeled. The logo is a marijuana leaf centered over an outline of the state. Will T-shirts and bumper stickers follow?

Biking to work is a great way to get exercise, save money and reduce pollution from cars. But does the risk of accidents cancel out all the good? Experience in Europe says no, but the U.S. lacks that tradition of urban bike travel.

In 1958, Lewis suffered a precipitous decline in popularity when people learned that his new wife was not only 13, but also his cousin. Nobody would touch his records. Then, in 1963, he signed a deal with Smash and it looked like things were getting better.

Following her brief testimony, she broke down and pleaded with the court, "Please bring justice for my daughter." Meanwhile, lawyers for the accused say their clients have been "tortured" since the beginning of the trial.

Jorge Rafael Videla ruled Argentina from 1976-1983 and orchestrated a "Dirty War" against opponents that killed as many as 30,000 people.

On Spirityouall, McFerrin performs classic black spirituals with roots in enslaved communities, as well as songs he composed himself. Throughout the album, he says, he hears the influence of his father, Robert McFerrin Sr., a renowned operatic baritone.

NPR's Ari Shapiro joins host Scott Simon to talk about the Obama administration's week. The president was buffeted by revelations that the IRS had targeted Tea Party groups seeking tax-exempt status and that the Justice Department had subpoenaed reporter phone records. On top of that, Republicans continue to allege that the White House engaged in a cover-up of talking points about the attack in Benghazi, Libya.

With the death of a possible suspect in one notorious case, activists are weighing the FBI's efforts to tackle cases from the 1950s and '60s. Some are calling for a congressional hearing to see whether the FBI has done enough investigating.

Host Scott Simon talks to NPR's David Folkenflik about the Justice Department's seizure of phone records of Associated Press reporters and editors, and Bloomberg's secret monitoring of its sources' and customers' activities.