Yemen is plunging further into chaos after rebels took over the presidential headquarters. CBS News senior security contributor Michael Morell talks about the ongoing conflict in the region. Source

After a series of sneak peeks, Microsoft is finally showing off its new Windows 10. Experts say it’s Microsoft’s last chance to prove Windows is still relevant. And we look at the desktop inside of a laptop. CNET senior editor Jeff Bakalar has a preview for CBSN. Source

Patients hospitalized for pneumonia have a significantly higher risk for heart attack or stroke, according to a new study. Also, a new warning about products with BPA. Eboni Williams reports on the day’s top health stories. Source

Vaccinations almost wiped out measles. But a recent trend in vaccination waivers is believed to have contributed to a new outbreak in southern California. At least one school is now telling certain students to stay home as a way to prevent the outbreak from spreading. Ben Tracy reports. Source

Ten-month-old conjoined twin girls in Houston are one step closer to leading separate lives. Knatalye Hope Mata and Adeline Faith Mata were born joined from the chest to the pelvis, but doctors are optimistic they can be separated. KHOU’s Kevin Reece reports. Source

“The Imitation Game” has cracked the code of critical and audience success. The movie earned eight Oscar nominations, including Best Director and Best Picture. The Weinstein Company co-chairman Harvey Weinstein joins “CBS This Morning” to discuss the movie and smear campaigns during awards season. Source

Astronaut Scott Kelly will try something no American has ever done before, while his twin, retired astronaut Mark Kelly, spends the mission on Earth. As NASA looks towards an eventual three-year long round trip to Mars, the Kelly brothers have become key to figuring out how to prepare for and protect the human body during lengthy trips in space. Don Dahler reports. Source

British researchers find people more than twice as likely to stop smoking, lose weight and begin exercising if their significant other does the same. Dr. Holly Phillips joins “CBS This Morning” to discuss the medical benefits of being with a partner. Source

Of all the Best Picture Oscar candidates, “American Sniper” is the biggest box office hit, making $90 million during its first weekend in wide release. But some critics say the movie packs a message that should not be rewarded at the Oscars. John Blackstone reports. Source

The Oscar-nominated film “American Sniper,” starring Bradley Cooper, made a record $105 million over the holiday weekend. Also, MTV aired its programming in black and white in honor of the Martin Luther King, Jr. holiday. Suzanne Marques reports on the day’s top entertainment stories. Source