Based on DNA Testing, Only One Twin Was Grant...

Would World War II have happened without Hitler? Would someone else have built Apple without Steve Jobs? Jared Diamond joins Michael Shermer to ask how much history depends on particular people. From Darwin's discoveries to the rise of Christianity, Diamond considers when someone ...  Show more

How did 19 hijackers evade the world's most advanced intelligence apparatus despite years of warnings? Twenty-five years after 9/11, journalist Gerald Posner joins Michael Shermer to explain the security failures that left America vulnerable. Those failures, compounded by governm ...  Show more

Nancy Segal (Deliberately Divided: Inside the Controversial Study of Twins and Triplets Adopted Apart) is an evolutionary psychologist, behavioral geneticist, and author. Nancy joins the Armchair Expert to discuss whether there’s anything predictable about a twin who comes out fi ...  Show more

Kate and Oliver are joined by Dr. Nancy Segal, a psychologist and Director of the Twin Studies Center at California State University, Fullerton for a fascinating conversation about all things twins. They discuss the science behind twins, nature vs. nurture, stories of twins wh ...

Nancy Segal is a professor at California State University, an author and one of the most prominent twin-study researchers on the planet. What makes you the person you are? Is it your genetics or your environment? When twins are either accidentally or purposefully separated at bir ...  Show more

From movie plots to ad campaigns to viral videos, if they feature twins, they grab our attention every time. But it’s not only the general public who are fascinated with twins. Over many decades, twins have garnered attention from psychologists and other researchers because of wh ...  Show more