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41. this difference remains at age five: Elaine
Aron, Psychotherapy and the Highly Sensitive
Person, 240–41.
42. even more resistant than other kids:
Boyce, “Psychobiologic Reactivity to Stress
and Childhood Respiratory Illnesses: Results
of Two Prospective Studies.” See also
W. Thomas Boyce and Bruce J. Ellis, “Biological
Sensitivity to Context: I. Evolutionary-
Developmental Theory of the Origins and
Functions of Stress Reactivity,” Development
and Psychopathology 27 (2005): 283.
43. The short allele of the SERT gene: See
Judith R. Homberg and Klaus-Peter Lesch,
“Looking on the Bright Side of Serotonin
Transporter Gene Variation,” Biological Psychiatry,
2010.
44. “sailors are so busy—and wisely—looking
under the water line”: Belsky et al.,
“Vulnerability Genes or Plasticity Genes?”