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After 241 days in orbit, astronaut Chris Williams is returning home from his first mission to the International Space Station.

Why was the U.S.'s first foreign war fought off the coast of North Africa? The answer has everything to do with trade, which has influenced American foreign policy for centuries.

A rock sample collected by NASA's Perseverance rover from the surface of Mars may contain evidence of ancient microbial life.

Forensic anthropologist and novelist Kathy Reichs writes what she knows: bones and crime. Reichs discusses her new novel Bones are Forever," and her work for the TV series "Bones" both of which star her fictional alter-ego, the scientist crime-solver Temperance Brennan.

As the investigation into the Boston Marathon bombings continues, countless questions remain about the suspects Tamerlan and Dzhokhar Tsarnaev. Washington Post senior editor Marc Fisher, discusses his in-depth profile of the Tsarnaevs and their journey to the U.S.

A federal advisory board has urged scientific journals not to publish the research from two labs that have developed an airborne flu virus. Microbiologist Vincent Racaniello discusses why the move sets a bad precedent. Biosecurity expert D.A. Henderson talks about the risks of publishing the research.

Discovery Channel's MythBusters have taken on more than 700 myths, from how hard it is to find a needle in a haystack (it's hard) to whether toothbrushes have fecal matter on them (they do). Series hosts Jamie Hyneman and Adam Savage talk about the show with host Ira Flatow.

Host Michel Martin and the Barbershop guys discuss the latest person to get into hot water on Twitter. CNN contributor Roland Martin was suspended for what critics called "homophobic" comments. The guys also weigh in on a controversial Senate campaign ad that critics are calling offensive.

In No Time to Lose: A Life In Pursuit of Deadly Viruses, microbiologist Peter Piot writes of the years he spent in the jungles of central Africa investigating mysterious viral diseases like Ebola and HIV, and recalls the bureaucratic struggles of leading UNAIDS.

The R&B star led all artists with nine nominations for the 66th Grammy Awards. She'll compete with Miley Cyrus, Taylor Swift, Olivia Rodrigo and Jon Batiste in album, song and record of the year.