Sapolsky — “Testosterone makes people cocky, egocentric, and narcissistic…”
Source: Behave: The Biology of Humans at Our Best and Worst — Robert M. Sapolsky
Book page: sapolsky-behave-part-1
From: Behave: The Biology of Humans at Our Best and Worst — Quotes
Testosterone makes people cocky, egocentric, and narcissistic.