Full episode 630: Things I Mean to Know Prologue Share a clip ByDavid KestenbaumDiane Wu Guest host David Kestenbaum talks to producer Diane Wu about a list she keeps of things she means to know. Sweet potatoes vs. yams. Are they different? The same? What exactly is going on there? (8 minutes) More in ScienceView all 689: Digging Up the Bones Dec. 6, 2019 Act Three: A Curious Bone David Kestenbaum tells the story of a man on the verge of one of the greatest scientific discoveries of all time … right on the verge. (4 minutes) 662: Where There Is a Will Nov. 16, 2018 Act Two: Life Is a Coin With One Side Producer David Kestenbaum took issue with the entire premise of today’s show, and explains why. 655: The Not-So-Great Unknown Aug. 24, 2018 Act One: So Over The Moon Producer David Kestenbaum tells the story of an astronaut who returns with a very unexpected view of the great beyond. More by David KestenbaumView all 735: Bloody Feelings Apr. 9, 2021 Act Two: Blood Ties The discovery of 30 century-old postcards written in old Yiddish by a distant family member challenges David Kestenbaum’s ideas about the unimportance of blood ties. 731: What Lies Beneath Feb. 12, 2021 Act One: Through The Eye Of A Needle Fewer than 40 million Americans have gotten the vaccine so far, which leaves a lot of people jealous and wondering what happens inside those little rooms. 727: Boulder v. Hill Dec. 18, 2020 Act Two: The Other Extinguishers For years one group of people has been trying to push a giant boulder to the top of a hill, like Sisyphus.