CBS News Sunday Morning Season 40 Episode 52 Feb 11, 2018

Guest host Ted Koppel presents a Valentine's Day-themed edition of CBS News Sunday Morning for the show's 40th season and 52nd episode, airing on Feb. 11, 2018. The program features a variety of segments exploring the ups and downs of relationships, as well as other stories of love and romance.

The episode opens with a tribute to the late actor and comedian John Mahoney, best known for his role on the long-running sitcom "Frasier." Correspondent Tracy Smith takes a look at Mahoney's life and career, from his early days in the theater to his breakout role on television. Friends and colleagues offer their memories of the beloved actor, who passed away earlier in February 2018.

Next up, correspondent Susan Spencer delves into the world of online dating, exploring the ways in which technology has changed the way we meet and form relationships. Spencer talks to experts and everyday users about the ups and downs of using apps and websites to find love, as well as the various challenges and pitfalls that come with the territory.

Moving on, correspondent Martha Teichner explores the phenomenon of "love locks," the padlocks that couples attach to bridges and other public structures as a symbol of their commitment to one another. Teichner speaks to couples who have left love locks all over the world, as well as to city officials and others who have concerns about the potential damage and safety risks associated with the practice.

Then, correspondent Holly Williams sits down with Cathy Freeman, the Australian athlete who became a national hero when she won the gold medal in the 400-meter sprint at the 2000 Sydney Olympics. Williams talks to Freeman about her rise to fame, as well as the challenges she faced growing up as an indigenous Australian. Freeman also discusses her work as an ambassador for the Olympic movement, and her ongoing efforts to promote sport and physical activity among young people.

In another segment, correspondent Lee Cowan visits the tiny town of Lovell, Wyoming, where a group of volunteers is working to preserve and restore the historic buildings that make up the town's Main Street. Cowan talks to some of the dedicated residents who are doing their part to keep Lovell's heritage alive, and learns about the challenges and rewards of this ongoing project.

Then, correspondent Faith Salie takes a look at the growing trend of "galentine's" day, a celebration of female friendships that has become increasingly popular in recent years. Salie speaks to women who have embraced this alternative to traditional Valentine's Day celebrations, and explores the ways in which these relationships can be just as meaningful and fulfilling as romantic partnerships.

Wrapping up the episode, Ted Koppel sits down with comedian Tom Papa to discuss his latest book, "Your Dad Stole My Rake: And Other Family Dilemmas." Koppel and Papa talk about the humor in everyday family life, as well as the challenges and joys of raising children and navigating relationships within a family.

Overall, CBS News Sunday Morning's Valentine's Day-themed episode for Feb. 11, 2018 offers a diverse and engaging array of stories about the ways in which love and relationships shape our lives. Whether exploring the highs and lows of online dating, celebrating the enduring power of female friendships, or paying tribute to the life and legacy of a beloved performer, the program offers a thoughtful and thought-provoking look at this most human of emotions.