[51]　但它们是地球上最丰富的生物粒子：‘Reengineering Life', Discovery, BBC Radio 4, 8 May 2017.
第四章　大脑：你的大脑80%都是水
[1]　大脑的稠度：‘Thanks for the Memory', New York Review of Books, 5 Oct. 2006; Lieberman, Evolution of the Human Head, p. 211.
[2]　总的来说，人类大脑可以容纳：‘Solving the Brain', Nature Neuroscience, 17 July 2013.
[3] 它只占我们体重的2％：Allen, Lives of the Brain, p. 188.
[4] 大脑是我们所有器官里最为昂贵的：Bribiescas, Men, p. 42.
[5] 大脑最高效的工作方式：Winston, Human Mind, p. 210.
[6]　这个数字似乎应该是86亿：‘Myths That Will Not Die', Nature, 17 Dec. 2015.
[7] 1立方厘米脑组织里：Eagleman, Incognito, p. 2.