Quote by David Buss
"Gratitude is an emotion that cements relationships based on reciprocal obligation."
More from David Buss
"Evolution is not just about survival of the fittest; it's about differential reproduction of the fittest."
"Jealousy is a powerful emotion that has shaped human behavior throughout history."
"Sexual jealousy is a universal human experience rooted in our evolutionary past."
"Understanding our evolutionary psychology helps us understand human nature."