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JOE PALCA, HOST:

This is SCIENCE FRIDAY. I'm Joe Palca.

You know the theory that a big collision, a comet or an asteroid, something like that, helped kill off the dinosaurs? The idea has been around for a while. But this week, new research published in journal Science provides more accurate dates for the giant impact and the dino demise.

We spend a lot of time sleeping (roughly one-third of our lives, according to the National Institutes of Health). But how much downtime do our brains really need? Experts discuss the links between sleep, memory and cognition, and why our sleep patterns change as we age.

The United States Postal Service said it lost $1.3 billion in first quarter of its fiscal year. While that's still a huge number, it's a big drop from the $3.1 billion loss the service posted during the same time period last year.

Still, CNN Money reports, the service is still in trouble. It reports:

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DAVID GREENE, HOST:

We want to go live now to the nation of Tunisia, where tens of thousands of people turned out today for the funeral of an assassinated opposition leader. Political tensions turned violent as young men clashed with police. The scene was a reminder of the precariousness of the situation in Tunisia - two years after the Arab Spring revolution began there. NPR's Eleanor Beardsley was at the funeral and joins me on the line. And Eleanor, what was the scene at this funeral? What did you see?

"Police and mourners clashed at the mass funeral on Friday of secular opposition leader Chokri Belaid, whose assassination has plunged Tunisia deeper into political crisis," Reuters writes.

According to the wire service, "braving chilly rain, at least 50,000 people turned out to honor Belaid in his home district of Jebel al-Jaloud in the capital, chanting anti-Islamist and anti-government slogans."

As the Africa Cup of Nations reaches fever pitch, allegations of unfair officiating are drowning out the trumpet-like vuvuzelas blasting in South Africa. Host Michel Martin speaks with Nigerian soccer journalist Osasu Obayiuwana for a look ahead to the final between Nigeria's Super Eagles and Burkina Faso's Stallions.

New Jersey Governor Chris Christie isn't laughing about his weight anymore. After poking fun at himself earlier this week, he ended up telling a former White House doctor to "shut up," when she commented on his size. Did he overreact? The Barbershop guys weigh in.

As a leader of the Southern Baptist Convention, Richard Land has spent nearly 25 years on the front lines of America's so-called 'culture war'. Now, as social conservatives worry that they're losing key policy battles, Land tells host Michel Martin that he may be stepping down from his post, but not from the fight.

Civil rights advocates have long relied on a principle called, "disparate impact," to prove minorities are discriminated in housing. Now, the Supreme Court is poised to review whether it's a legitimate tool in such cases. Host Michel Martin speaks with investigative journalist Nikole Hannah-Jones, who has written about the issue for ProPublica.

Talk about the ultimate space jam.

The song is called "I.S.S. (Is Somebody Singing)," and it's billed as the first space-Earth musical collaboration. The project is a very long-distance project from Canadians Ed Robertson of Barenaked Ladies and Chris Hadfield, who currently commands the International Space Station.