Sources
Darwin. Charles Darwin, Autobiography (Project Gutenberg eBook #2010); letter to William Graham, 3 July 1881, Darwin Correspondence Project DCP-LETT-13230.
The 20-watt brain. Clarke & Sokoloff, Basic Neurochemistry, ch. 31; Raichle & Gusnard, PNAS 99 (2002); Brain power, PNAS 118 (2021).
The data-centre grid. IEA, Energy and AI, 10 April 2025.
Landauer's limit. R. Landauer, IBM J. Res. Dev. 5(3), 1961, pp. 183-191.
Solar input. Solar constant 1361 W/m2 across the Earth's cross-section; albedo ~30%.
Dirac and Feynman. Paul A. M. Dirac, "The Lagrangian in Quantum Mechanics", Mathematical Proceedings of the Cambridge Philosophical Society 29(3), 1933, pp. 292–299; Feynman's Thesis — A New Approach to Quantum Theory (World Scientific, 2005); Lawrence M. Krauss, Quantum Man (2011); Graham Farmelo, The Strangest Man (2009).
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