The Grandmother Hypothesis

According to the "grandmother hypothesis," humans have grandmas, nanas and bubbies to thank for their longer lifespans. In this episode, Cristen and Caroline reveal the compelling science and evolution behind these important maternal figures.

STEM Women Hall of Fame: Evolutionary Revolutionary

Women on the Hunt

Since sport hunting is on the rise among women, Cristen and Caroline take aim at the intersection of gender and hunting from early hunter-gather societies to the wild West to its most recent women-led resurgence.

Breasts 101 with Florence Williams

Florence Williams, the author of "Breasts: A Natural and Unnatural History," stops by the show to talk about the evolution of breasts, the history of breast implants and how environmental toxins are invading breast tissues.

The Wedding Ring Phenomenon

Recently, a Stuff Mom Never Told You listener wrote in with a perplexing question about she terms "the wedding ring phenomenon": "...a guy, lets call him John, told us about how he will wear a wedding ring while trying to pick up women. I thought it was appalling and completely ludicrous, but my husband thought it made sense... I was curious if you know of any research backing this wedding ring phenomenon or if the men in my life are just full of themselves."

Most people are familiar with the trope of the terrible, no good mother-in-law, and studies confirm often-strained mother-in-law relationships. So does this stereotype have evolutionary roots? Listen in to learn more.

Are men or women more cooperative? In this episode, Caroline and Cristen explore the science of cooperation, including how selfishness evolutionarily bred cooperation.

In this episode, Cristen and Caroline explore the etymology of the term "frenemy," the psychology of female friendships and women's evolutionary tendencies toward cultivating friendships. Tune in to learn more.

Masturbation can be a sensitive subject, and many people are uncomfortable asking questions about the practice. For example: Do men masturbate more than women? Is there an evolutionary explanation for masturbation? Tune in to learn more.

Why do men have nipples?

Why haven't males evolved to not have nipples? Many newborns lactate "witches milk" soon after birth. Can men lactate? Listen in as Cristen and Caroline tackle these questions and more in this episode.