A 35-acre graveyard of tires off the coast of Florida was once meant to be an artificial reef. But it is now causing problems it was supposed to prevent. Divers are working to clean up the mess. Barry Petersen has a look at what went wrong. Source

Hundreds of U.S. troops were quietly sent to West Africa in a mission to help Cameroon’s army fight Islamic militants linked to ISIS. Debora Patta went along with the troops for an inside look. Source

Popular hair care line Wen is facing backlash and lawsuits. Major celebrities like Brooke Shields, Alyssa Milano and Angie Harmon have endorsed the hair products, but now hundreds of customers say the line created by Hollywood stylist Chaz Dean caused their hair to fall out. Anna Werner reports. Source

George Lucas discusses the new Star Wars film “The Force Awakens” and reflects on his life. CBS This Morning co-host Charlie Rose joins CBSN to discuss his interview with Lucas. Source

The Los Angeles Unified School District closed schools Tuesday after receiving an “electronic” threat. The threat is still being evaluated. Source

Lack of clarity on coronavirus restrictions creating confusion for the public; Former Attorney General Ramsey Clark dies at 93 Source

Every weekday morning, millions of American kids wake up and go to school, usually under the watchful eye of an adult. But in Japan, children are expected to make the journey alone. In the Tokyo metro area, where the population tops 38 million, that trip can last up to an hour, covering several miles. Seth Doane visited one family to learn how students going solo are protected. Source

Several high-temperature records dating back to the 1800s were broken this past weekend across the country, but the mild weather means some retailers are feeling the heat when it comes to selling their winter goods. Advertising Age managing editor Natalie Zmuda joins “CBS This Morning” to discuss the impact of warm weather on sales. Source

NASA is planning a human mission to Mars for the 2030s. The agency has opened its application process for the next class of space travelers and hopes a record-breaking number of qualified Americans apply. But while space is a curiosity for many, the NASA job requires qualifications that may not be a good fit for everyone. Jan Crawford reports. Source

Fans have shut down Hollywood Boulevard ahead of “Star Wars: The Force Awakens” premiere. KCBS reporter Suzanne Marques reports from the red carpet. Source