[29] 因为它增加了头发表面和头皮之间的空间厚度:Jablonski interview.
[30] 人类似乎并没有信息素:‘Do Human Pheromones Actually Exist?', Science News, 7 March 2017.
[31] 次级毛发是为了展示之用:Bainbridge, Teenagers, pp. 44-45.
[32] 我们每个人一生会长出大约8米的头发:The Curious Cases of Rutherford and Fry, BBC Radio 4, 22 Aug. 2016.
[33] 该系统引入了“面部照片”(mugshot)的概念和做法:Cole, Suspect Identities, p. 49.
[34] 头一个确定指纹独特性:Smith, Body, p. 409.
[35] 它们有助于抓握:Linden, Touch, p. 37.