Author and YouTuber John Green thought his breakout bestseller wouldn’t be a commercial success, wrote 40,000 words for one sentence, and brought Steve to tears.

• SOURCE:
  • John Green, best-selling author and YouTube creator.

• RESOURCES:
  • "The Deadliest Infectious Disease Isn’t a Science Problem. It’s a Money Problem," by John Green (The Washington Post, 2024).
  • “Tuition Inflation Isn’t as Bad as You Think,” by Felix Salmon (Axios, 2022).
  • “Fast Facts: Expenditures,” by the National Center for Education Statistics (2022).
  • “Trends in College Pricing and Student Aid 2021,” by the College Board (2021).
  • “#37 John,” by Heavyweight (2021).
  • The Anthropocene Reviewed: Essays on a Human-Centered Planet, by John Green (2021).
  • “Scratch ‘n’ Sniff Stickers and the Indianapolis 500,” by The Anthropocene Reviewed Podcast (2019).
  • “How Joan of Arc Conquered Mark Twain,” by Ted Gioia (America: The Jesuit Review, 2018).
  • Turtles All the Way Down, by John Green (2017).
  • The Fault in Our Stars, film (2014).
  • The Fault in Our Stars, by John Green (2012).
  • Looking for Alaska, by John Green (2005).
  • All the King’s Men, by Robert Penn Warren and Noel Polk (1946).
  • Harvey, film (1950).
  • vlogbrothers, YouTube channel by John and Hank Green.
  • Crash Course, YouTube channel by John and Hank Green.

• EXTRAS:
  • “Peter Singer Isn’t a Saint, But He’s Better Than Steve Levitt,” by People I (Mostly) Admire (2022).
  • “Freakonomics Radio Goes Back To School,” series by Freakonomics Radio (2022).

Suleika Jaouad was diagnosed with cancer at 22. She made her illness the subject of a New York Times column and a memoir, Between Two Kingdoms. She and Steve talk about what it means to live with a potentially fatal illness, how to talk to people who've gone through a tragedy, and ways to encourage medical donations.

• SOURCE:
  • Suleika Jaouad, author.

• RESOURCES:
  • "The Art of Survival," by Jennifer Senior (The Atlantic, 2024).
  • American Symphony, film by Matthew Heineman (2023).
  • Between Two Kingdoms: A Memoir of a Life Interrupted, by Suleika Jaouad (2021).
  • "Max Ritvo, Poet Who Chronicled His Cancer Fight, Dies at 25," by John Schwartz (The New York Times, 2016).
  • “Life, Interrupted,” column by Suleika Jaouad (The New York Times, 2012-2015).
  • The Fault in Our Stars, by John Green (2012).
  • Bright-sided: How Positive Thinking Is Undermining America, by Barbara Ehrenreich (2009).
  • The Isolation Journals, newsletter by Suleika Jaouad.

• EXTRAS:
  • "John Green’s Reluctant Rocket Ship Ride," by People I (Mostly) Admire (2022).
  • "Does Death Have to Be a Death Sentence?" by People I (Mostly) Admire (2022).

Caroline Paul is a thrill-seeker and writer who is on a quest to encourage women to get outside and embrace adventure as they age. She and Steve talk about fighting fires, walking on airplane wings, and finding awe in birdwatching.

• SOURCE:
  • Caroline Paul, author and former firefighter.

• RESOURCES:
  • Tough Broad: From Boogie Boarding to Wing Walking ― How Outdoor Adventure Improves Our Lives as We Age, by Caroline Paul (2024).
  • "FAA Halts Sequim Wing-Walking Flights, Revokes Owner’s Pilot License," by Dominic Gates (The Seattle Times, 2024).
  • "How a Bit of Awe Can Improve Your Health," by Hope Reese (The New York Times, 2023).
  • The Gutsy Girl: Escapades for Your Life of Epic Adventure, by Caroline Paul (2016).
  • "Why Do We Teach Girls That It’s Cute to Be Scared?" by Caroline Paul (The New York Times, 2016).
  • "What if Age Is Nothing but a Mind-Set?" by Bruce Grierson (The New York Times Magazine, 2014).
  • Lost Cat: A True Story of Love, Desperation, and GPS Technology, by Caroline Paul (2013).
  • "The Cognitive Benefits of Interacting With Nature," by Marc G. Berman, John Jonides, and Stephen Kaplan (Psychological Science, 2008).
  • "Longevity Increased by Positive Self-Perceptions of Aging," by Becca R. Levy, Martin D. Slade, Suzanne R. Kunkel, and Stanislav V. Kasl (Journal of Personality and Social Psychology, 2002).
  • Fighting Fire, by Caroline Paul (1998).

• EXTRAS:
  • "Is Fear Running Your Life?" by No Stupid Questions (2024).
  • "Arnold Schwarzenegger Has Some Advice for You," by People I (Mostly) Admire (2024).
  • "Should You Spend More Time in Nature?" by No Stupid Questions (2023).
  • "Steven Pinker: 'I Manage My Controversy Portfolio Carefully,'" by People I (Mostly) Admire (2020).

Steve shows a different side of himself in very personal interviews with his two oldest daughters. Amanda talks about growing up with social anxiety and her decision not to go to college, while Lily speaks candidly about her battle with anorexia and the conversation she had with Steve that led her to seek treatment.

• SOURCES:
  • Lily Levitt, daughter of Steve Levitt.
  • Amanda Levitt, daughter of Steve Levitt.

• RESOURCES:
  • Can I Ask You a Question? by Amanda Levitt (2020).
  • "Does “Early Education” Come Way Too Late?" Freakonomics Radio (2018).

• EXTRAS:
  • NEDA Crisis Support.

The economist Joseph Stiglitz has devoted his life to exposing the limits of markets. He tells Steve about winning an argument with fellow Nobel laureate Milton Friedman, why small governments don’t lead to more freedom, and why he’s not afraid to be an advocate.

• SOURCE:
  • Joseph Stiglitz, professor at Columbia University and chief economist at the Roosevelt Institute.

• RESOURCES:
  • The Road to Freedom: Economics and the Good Society, by Joseph Stiglitz (2024).
  • "Equilibrium in Competitive Insurance Markets: An Essay on the Economics of Imperfect Information," by Michael Rothschild and Joseph Stiglitz (The Quarterly Journal of Economics, 2010).
  • "Hirsh: The Missing Link on Obama's Economic Team," by Michael Hirsh (Newsweek, 2008).
  • Globalization and Its Discontents, by Joseph Stiglitz (2002).
  • Two Lucky People: Memoirs, by Milton Friedman and Rose Friedman (1998).
  • "On Value Maximization and Alternative Objectives of the Firm," by Sanford Grossman and Joseph Stiglitz (The Journal of Finance, 1977).

• EXTRAS:
  • "Remembering Daniel Kahneman," by People I (Mostly) Admire (2024).
  • "Ninety-Eight Years of Economic Wisdom," by People I (Mostly) Admire (2023).

Monica Bertagnolli went from a childhood on a cattle ranch to a career as a surgeon to a top post in the Biden administration. As director of the National Institutes of Health, she’s working to improve the way we find new treatments — despite regulatory constraints and tight budgets.

• SOURCE:
  • Monica Bertagnolli, director of the National Institutes of Health.

• RESOURCES:
  • "Steven Levitt and John Donohue Defend a Finding Made Famous by 'Freakonomics'," by Steven Levitt and John Donohue (The Economist, 2024).
  • "Why 'Freakonomics' Failed to Transform Economics," (The Economist, 2024).
  • "Steven D. Levitt (Freakonomics Co-Author and U Chicago Econ Prof) on His Career and Decision to Retire From Academic Economics," by Jon Hartley (The Capitalism and Freedom in the Twenty-First Century Podcast, 2024).
  • "Why Autoimmune Disease Is More Common in Women: X Chromosome Holds Clues," by Elie Dolgin (Nature, 2024).
  • "Casgevy and Lyfgenia: Two Gene Therapies Approved for Sickle Cell Disease," by Carrie MacMillan (Yale Medicine News, 2023).
  • "Fact Sheet: President Biden Reignites Cancer Moonshot to End Cancer as We Know It," (2022).
  • "Mini-Antibodies Discovered in Sharks and Camels Could Lead to Drugs for Cancer and Other Diseases," by Mitch Leslie (Science, 2018).

• EXTRAS:
  • "Who Pays for Multimillion-Dollar Miracle Cures?" by Freakonomics, M.D. (2023).
  • "What’s Stopping Us From Curing Rare Diseases?" by Freakonomics, M.D. (2023).
  • "Abortion and Crime, Revisited (Update)," by Freakonomics Radio (2022).
  • "John Donohue: 'I’m Frequently Called a Treasonous Enemy of the Constitution,'" by People I (Mostly) Admire (2021).

Nobel laureate, bestselling author, and groundbreaking psychologist Daniel Kahneman died in March. In 2021 he talked with Steve Levitt — his friend and former business partner — about his book Noise: A Flaw in Human Judgment (cowritten with Olivier Sibony and Cass Sunstein) and much more.

• SOURCES:
  • Daniel Kahneman, professor emeritus of psychology and public affairs at Princeton University.

• RESOURCES:
  • Noise: A Flaw in Human Judgment, by Olivier Sibony, Daniel Kahneman, and Cass R. Sunstein (2021).
  • Thinking, Fast and Slow, by Daniel Kahneman (2011).

• EXTRAS:
  • "What’s the Secret to Making a Great Prediction?" by No Stupid Questions (2021).
  • "The Men Who Started a Thinking Revolution," by Freakonomics Radio (2017).
  • "How to Be Less Terrible at Predicting the Future," by Freakonomics Radio (2016).

Google researcher Blaise Agüera y Arcas spends his work days developing artificial intelligence models and his free time conducting surveys for fun. He tells Steve how he designed an algorithm for the U.S. Navy at 14, how he discovered the truth about printing-press pioneer Johannes Gutenberg, and when A.I. first blew his mind.

• SOURCE:
  • Blaise Agüera y Arcas, fellow at Google Research.

• RESOURCES:
  • Who Are We Now?, by Blaise Agüera y Arcas (2023).
  • "Artificial General Intelligence Is Already Here," by Blaise Agüera y Arcas and Peter Norvig (Noema Magazine, 2023).
  • "Transformer: A Novel Neural Network Architecture for Language Understanding," by Jakob Uszkoreit (Google Research Blog, 2017).
  • "Communication-Efficient Learning of Deep Networks from Decentralized Data," by H. Brendan McMahan, Eider Moore, Daniel Ramage, Seth Hampson, and Blaise Agüera y Arcas (arXiv, 2016).
  • "How PhotoSynth Can Connect the World's Images," by Blaise Agüera y Arcas (TED Talk, 2007).
  • "Has History Been Too Generous to Gutenberg?" by Dinitia Smith (The New York Times, 2001).

• EXTRAS:
  • "'My God, This Is a Transformative Power,'" by People I (Mostly) Admire (2023).
  • "How to Think About A.I.," series by Freakonomics Radio (2023).
  • "Satya Nadella’s Intelligence Is Not Artificial," by Freakonomics Radio (2023).
  • "Yul Kwon (Part 2): 'Hey, Do You Have Any Bright Ideas?'" by People I (Mostly) Admire (2021).
  • "Yul Kwon: 'Don’t Try to Change Yourself All at Once,'" by People I (Mostly) Admire (2021).