selfish

A recent study shows that selfish people will not be advantageous in evolution and will sooner or later be extinct.

The majority of young children are easily agitated, only thinking about themselves, being reckless because their brains develop more slowly than their bodies.

Can the chemicals in your body affect your personality: generous or selfish? In recent years, experiments have explored the role of a substance called oxytocin - a substance that

Livescience reported that Nicholas Wright, a scientist at University College London in England, and colleagues conducted a test to test the effects of testosterone, male sexual