Sources, page 24 of 24

The figure of roughly 65% of the world's adults with some degree of lactose malabsorption is widely repeated in review literature built on Tishkoff et al.

In the reference library: Topic 37 note 10

Current consensus estimates put Neanderthal ancestry in non-African genomes at roughly 1 to 2%, with point estimates near 1.

In the reference library: Topic 37 note 18

Plato. Phaedrus, approximately 274c-275b (Stephanus pagination). No translation is quoted here; the argument is paraphrased.

In the reference library: Topic 44 note 14

Finnish schools typically give 15 minutes of unstructured break for every 45 minutes of instruction; the Basic Education Decree requires at least 45 minutes of teaching in each lesson hour: Perusopetusasetus (Basic Education Decree) 852/1998, section 3. https://www.finlex.fi/fi/laki/ajantasa/1998/19980852 finlex.fi

In the reference library: Topic 45 note 22

Japan's broadcast group calisthenics program, rajio taiso, has aired since 1 November 1928 (NHK) and is still broadcast each morning; participation is described as millions, with no rigorous modern count. Program history as published by NHK, the national broadcaster.

In the reference library: Topic 45 note 24

Japan has roughly 62 to 65 government-certified Forest Therapy Bases or Roads under a certification program running since 2006, as listed by the Forest Therapy Society of Japan. Chapter 27 sources the forest-bathing immune studies in full.

In the reference library: Topic 45 note 25

Tamera, in the Alentejo region of Portugal, was founded in 1995 by Dieter Duhm, Sabine Lichtenfels and Rainer Ehrenpreis; roughly 130 to 140 hectares; resident population roughly 150 to 250 depending on the year; a water-retention landscape of lakes, ponds and about 20,000 trees was designed with Sepp Holzer from around 2007. Figures as published by the community itself; its self-sufficiency claims are self-reported.

In the reference library: Topic 45 note 29

US Food and Drug Administration. fda.gov

In the book: Chapter 10 note 16

988 Suicide and Crisis Lifeline. 988lifeline.org

In the book: Chapter 13 note 26, Chapter 14 note 31

Drug Enforcement Administration, Diversion Control Division. deadiversion.usdoj.gov

In the book: Chapter 14 note 9

American Psychiatric Association. psychiatry.org

In the book: Chapter 14 note 22

Perusopetusasetus (Basic Education Decree) 852/1998, section 3. finlex.fi

In the book: Epilogue note 3

Örtqvist, A.K., Lundholm, C., Kieler, H., Ludvigsson, J.F., et al (2014). Antibiotics in fetal and early life and subsequent childhood asthma: nationwide population based study with sibling analysis. BMJ. 10.1136/bmj.g6979

In the reference library: Topic 18 note 59

Čad, E.M., Mars, M., Pretorius, L., van der Kruijssen, M., et al (2026). The Sweet Tooth Trial: a parallel randomized controlled trial investigating the effects of a 6-month low, regular, or high dietary sweet taste exposure on sweet taste liking, and various outcomes related to food intake and weight status. American Journal of Clinical Nutrition. 10.1016/j.ajcnut.2025.09.041

In the reference library: Topic 15 note 63