Evolutionary psychologists believe that human nature is the reason for our behavior. It’s true that people sometimes make decisions that have nothing to do with consciousness. We’re inclined to enter into risk or buy expensive things because it’s a developed psychological mechanism. Though, we don’t necessarily choose danger and prestige consciously, we do think that they’ll make our life brighter.

In this article, Bright Side would like to talk about biological and social factors that affect human behavior. Some conclusions might seem immoral, irrational, and even offensive to you. It’s not our intention to make you agree with the authors of the studies you’ll find here, we just want to show you that there are different opinions explaining the motivation of different human actions.

1. Unpleasant people seem bigger and stronger to us than they are in reality.

, © Gregorio T. Binuya / Everett Collection / EAST NEWS

Economists Gordon B. Dahl and Enrico Moretti conducted research and discovered an interesting fact. Couples who have daughters have a higher risk of divorce than couples with at least one son. And not only that, but child custody, marriage patterns, shotgun marriages, fertility stopping rules, and child support payments are likely defined by a chromosome. The researchers say that the reason lies in the male preference for a son.

Do you think the scientists are right, or maybe they overestimate the influence of biological factors on our behavior? Are there theories in this list which you completely disagree with? Tell us in the comments below.

Please note: This article was updated in April 2022 to correct source material and factual inaccuracies.