This past fall, a scientist named Steve Hsu made headlines with a provocative announcement. He would start selling a genetic intelligence test to couples doing IVF: a sophisticated prediction tool, built on big data and machine learning, designed to help couples select the best embryo in their batch. We wondered, how does that work? What can the test really say? And do we want to live in a world where certain people can decide how smart their babies will be? This episode was produced by Simon Adler, with help from Rachael Cusick and Pat Walters. Fact-checking by Michelle Harris. Engineering help from Jeremy Bloom. Special thanks to Catherine Bliss. Radiolab’s “G” is supported in part by Science Sandbox, a Simons Foundation initiative dedicated to engaging everyone with the process of science.

When a law student named Mark Bold came across a Supreme Court decision from the 1920s that allowed for the forced sterilization of people deemed “unfit,” he was shocked to discover that it had never been overturned. His law professors told him the case, Buck v Bell, was nothing to worry about, that the ruling was in a kind of legal limbo and could never be used against people. But he didn’t buy it. In this episode we follow Mark on a journey to one of the darkest consequences of humanity’s attempts to measure the human mind and put people in boxes, following him through history, science fiction and a version of eugenics that’s still very much alive today, and watch as he crusades to restore a dash of moral order to the universe. This episode was produced by Matt Kielty, Lulu Miller and Pat Walters.  You can pre-order Lulu Miller’s new book Why Fish Don’t Exist here. Special thanks to Sara Luterman, Lynn Rainville, Alex Minna Stern, Steve Silberman and Lydia X.Z. Brown. Radiolab’s “G” is supported in part by Science Sandbox, a Simons Foundation initiative dedicated to engaging everyone with the process of science.

In the first episode of G, Radiolab’s miniseries on intelligence, we went back to the 1970s to meet a group of Black parents who put the IQ test on trial. The lawsuit, Larry P v Riles, ended with a ban on IQ tests for all Black students in the state of California, a ban that’s still in place today. This week, we meet the families in California dealing with that ban forty years later. Families the ban was designed to protect, but who now say it discriminates against their children. How much have IQ tests changed since the 70s? And can they be used for good? We talk to the people responsible for designing the most widely used modern IQ test, and along the way, we find out that at the very same moment the IQ test was being put on trial in California, on the other side of the country, it was being used to solve one of the biggest public health problems of the 20th century. This episode was reported and produced by Pat Walters, Rachael Cusick and Jad Abumrad, with production help from Bethel Habte. Music by Alex Overington. Fact-checking by Diane Kelly. Special thanks to Lee Romney, Moira Gunn and Tech Nation, and Lee Rosevere for his song All the Answers.   Radiolab’s “G” is supported in part by Science Sandbox, a Simons Foundation initiative dedicated to engaging everyone with the process of science.

Are some ideas so dangerous we shouldn’t even talk about them? That question brought Radiolab’s senior editor, Pat Walters, to a subject that at first he thought was long gone: the measuring of human intelligence with IQ tests. Turns out, the tests are all around us. In the workplace. The criminal justice system. Even the NFL. And they’re massive in schools. More than a million US children are IQ tested every year. We begin Radiolab Presents: “G” with a sentence that stopped us all in our tracks: In the state of California, it is off-limits to administer an IQ test to a child if he or she is Black. That’s because of a little-known case called Larry P v Riles that in the 1970s … put the IQ test itself on trial. With the help of reporter Lee Romney, we investigate how that lawsuit came to be, where IQ tests came from, and what happened to one little boy who got caught in the crossfire. This episode was reported and produced by Lee Romney, Rachael Cusick and Pat Walters. Music by Alex Overington. Fact-checking by Diane Kelly. Special thanks to Elie Mistal, Chenjerai Kumanyika, Amanda Stern, Nora Lyons, Ki Sung, Public Advocates, Michelle Wilson, Peter Fernandez, John Schaefer. Lee Romney’s reporting was supported in part by USC’s Center for Health Journalism. Radiolab’s “G” is supported in part by Science Sandbox, a Simons Foundation initiative dedicated to engaging everyone with the process of science. Support Radiolab today at Radiolab.org/donate.