502 Conversations - Science, Skepticism, Pseudoscience, Philosophy, and more.

Carlos Orsi is an award-winning journalist with more than thirty years of experience in science writing. He is a director and cofounder of IQC, a Brazilian NGO dedicated to promoting science-based public policies, critical thinking, and scientific skepticism. Carlos is the chief editor of Revista Questão de Ciência, and his writing has also appeared in The Skeptical Inquirer and The Skeptic (UK). His new book is “What Science Says About Astrology.” A video version of this conversation is available at https://youtu.be/sOg-AAoDFqM or at briankerby.com © 2026 Dedham TV. Unauthorized duplication, for any reason, without permission, is prohibited.

Dr. William Matthew London is professor emeritus, Cal State LA, Department of Public Health. He is the editor of Center for Inquiry’s Quackwatch e-newsletter Consumer Health Digest, is content curator for Quackwatch's HHS Watch pages and is the online Consumer Health columnist for Skeptical Inquirer. Dr. London is also a fellow of the Committee for Skeptical Inquiry. This episode is also available as a video here https://youtu.be/-7owi4DzspU© 2026 Dedham TV. Unauthorized duplication, for any reason, without permission, is prohibited. Links: quackwatch.org

Dr. Joe is director of the McGill Office for Science and Society, which aims to separate sense from nonsense. Dr. Joe holds a PhD in chemistry and is well known for his informative and entertaining public lectures on topics ranging from the chemistry of love to the science of aging. © 2026 Dedham TV. Unauthorized duplication, for any reason, without permission, is prohibited. A video version of this podcast is available at https://youtu.be/FjYdbTelmtA or at briankerby.com

A rebuttal, of sorts, to episode 134 of The Body of Evidence, "Medical Cannabis: Where Are We?".Dr. Labos is a cardiologist with a degree in epidemiology. He writes for the Montreal Gazette, makes regular appearances on CBC radio and TV, and is host of The Body of Evidence podcast, where he takes a skeptical eye at health claims and looks at the body of evidence on a varietyof health topics. He is a Course Lecturer in the Department of Epidemiology,Biostatistics and Occupational Health. He is also the author of the book: Does Coffee Cause Cancer and Eight More Myths About the Food We Eat. © 2026 Dedham TV. Unauthorized duplication, for any reason, without permission, is prohibited. A video version of this video is available at https://youtu.be/H2KuLpC_W48 or at briankerby.comBody of Evidence medical cannabis episodehttps://bodyofevidence.ca/134-medical-cannabis-where-are-we Dr. Labos’ article on cannabis and driving: https://montrealgazette.com/opinion/columnists/christopher-labos-the-risks-of-mixing-driving-and-cannabisSelected sources:Di Ciano, P., Rajji, T. K., Hong, L. E., Zhao, S. Y. F., Byrne, P., Elzohairy, Y., Brubacher, J. R., McGrath, M. J., Brands, B., Chen, S., Wang, W., Hasan, O. S. M., Wickens, C. M., Kaduri, P., & Foll, B. L. (2024). Cannabis and Driving in Older Adults. JAMA, 7(1), e2352233. https://doi.org/10.1001/jamanetworkopen.2023.52233Han, B. H., Brennan, J. J., Orozco, M. A., Moore, A. A., & Castillo, E. M. (2023). Trends in Emergency Department Visits Associated With Cannabis Use Among Older Adults in California, 2005–2019. Journal of the American Geriatrics Society, 71(4), 1267–1274. https://doi.org/10.1111/jgs.18180Hughes, A. R., Grusing, S., Lin, A., Hendrickson, R. G., Sheridan, D. C., Marshall, R., & Horowitz, B. Z. (2022). Trends in intentional abuse and misuse ingestions in school-aged children and adolescents reported to US poison centers from 2000-2020. Clinical Toxicology, 61(1), 64–71. https://doi.org/10.1080/15563650.2022.2120818Jeffers, A. M., Glantz, S., Byers, A. L., & Keyhani, S. (2024). Association of cannabis use with cardiovascular outcomes among US adults. Journal of the American Heart Association, 13(5), e030178. https://doi.org/10.1161/jaha.123.030178Jefsen, O. H., Erlangsen, A., Nordentoft, M., & Hjorthøj, C. (2023). Cannabis use disorder and subsequent risk of psychotic and nonpsychotic unipolar depression and bipolar disorder. JAMA Psychiatry, 80(8), 803. https://doi.org/10.1001/jamapsychiatry.2023.1256Kamel, I., Mahmoud, A. K., Twayana, A. R., Younes, A. M., Horn, B., & Dietzius, H. (2025). Myocardial Infarction and Cardiovascular Risks Associated With Cannabis Use: A Multicenter Retrospective Study. JACC Advances, 101698. https://doi.org/10.1016/j.jacadv.2025.101698Myran, D. T., Gaudreault, A., Pugliese, M., Dujovny, M., & Tanuseputro, P. (2023). Cannabis-Involved traffic injury emergency department visits after cannabis legalization and commercialization. JAMA, 6(9), e2331551. https://doi.org/10.1001/jamanetworkopen.2023.31551Pierce, A. (2023, January 9). Cannabis-Related Emergency Department Visits Among Older Adults on the Rise. https://health.ucsd.edu/news/press-releases/2023-01-09-cannabis-related-emergency-department-visits-among-older-adults-on-the-rise/Pravosud, V. (2025). Cannabis use among older adults. JAMA. https://doi.org/10.1001/jamanetworkopen.2025.10173Stall, N. M., Shi, S., Malikov, K., Wang, S., Rochon, P. A., Hillmer, M. P., & Zipursky, J. S. (2024). Edible cannabis legalization and cannabis poisonings in older adults. JAMA Internal Medicine, 184(7), 840. https://doi.org/10.1001/jamainternmed.2024.1331Toce, M. S., Monuteaux, M. C., Fishman, M. D., & Hudgins, J. D. (2025). Emergency department visits for cannabis hyperemesis syndrome among adolescents. JAMA Network Open, 8(7), e2520492. https://doi.org/10.1001/jamanetworkopen.2025.20492 

Timothy Redmond, PhD teaches high school history, government, and critical thinking and is an adjunct professor at Daemen College. He is a Jackson Center fellow, the recipient of the 2019 Toby Ticktin Back Award for excellence in Holocaust education, and an associate director of the Human Rights Academy. He is the author of Political Tribalism in America: How Hyper-Partisanship Dumbs Down Democracy and How to Fix It. Dr. Redmond also has a monthly newspaper column, “The Examined Life,” which appears in the East Aurora Advertiser.© 2025 Dedham TV. Unauthorized duplication, for any reason, without permission, is prohibited. A video of this conversations is available at https://youtu.be/nmb5aOpim34