The story of Jacob and Esau is told in the book of Genesis. With his mother's help, Jacob impersonates his hairy older twin by dressing in Esau's clothes and covering his own hands and the nape of his neck with the hairy hide of goats. Fooled by this ruse, their blind father, Isaac, is tricked into giving the younger son the blessing of the firstborn. This is only one of many biblical stories in which hair plays a pivotal role. In recent years,...