Dr. Habiba Chirchir - Why did humans evolve to have less robust skeletons?

Dr. Habiba Chirchir of the Ohio State University joins the show to discuss her research into the skeletal gracilization of modern humans. She's trying to understand when and why our skeletons became less robust, and whether self-domestication may have played a role.

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Note: Apparently I got Dmitry Belyayev confused with Nikolai Vavilov. Both geneticists worked in the Soviet Union, but Dr. Belyayev wasn't persecuted to the same extent as Vavilov.

Vavilov, who based his work on Mendelian genetics, ultimately died in prison for daring to go against Stalin's favored genetic model created by Trofim Lysenko and based on Lamarckism.

Also worth noting: The contributions of Lyudmila Trut who worked with Dr. Belyayev and continued running the study after his death.

Books, articles, and media mentioned in this episode + helpful sites and articles:

• Dr. Chirchir's staff page at OSU
• Dr. Chirchir's personal and lab website
• Assif, L., & Chirchir, H. (2024). Trabecular bone morphology in big cats reflects the complex diversity of limb use but not home range size or daily travel distance. The Anatomical Record, 307(1), 208–222. https://doi.org/10.1002/ar.25302
• H. Chirchir, T.L. Kivell, C.B. Ruff, J. Hublin, K.J. Carlson, B. Zipfel, & B.G. Richmond, Recent origin of low trabecular bone density in modern humans, Proc. Natl. Acad. Sci. U.S.A. 112 (2) 366-371, https://doi.org/10.1073/pnas.1411696112 (2015).
• Chirchir H, Ruff CB, Junno J-A, and Potts R. Low trabecular bone density in recent sedentary modern humans. Am J Phys Anthropol. 2017; 162:e23138. doi:10.1002/ajpa.23138.
• Chirchir, H. (2019), Trabecular Bone Fraction Variation in Modern Humans, Fossil Hominins and Other Primates. Anat. Rec., 302: 288-305. https://doi.org/10.1002/ar.23967
• H. Chirchir, T.L. Kivell, C.B. Ruff, J. Hublin, K.J. Carlson, B. Zipfel, & B.G. Richmond, Recent origin of low trabecular bone density in modern humans, Proc. Natl. Acad. Sci. U.S.A. 112 (2) 366-371, https://doi.org/10.1073/pnas.1411696112 (2015).
• Chirchir Habiba, Ruff Christopher, Hel