Why are teenagers often rebellious?
Adolescents are an age that is emotionally susceptible, sensitive to many problems around, even strange behaviors, thought to be due to facing anxiety disorders.'Bad habits' make you unexpectedly happy
Under the lens of science, bad habits help you become a happy personFace primate and social life
American biologists say most primates have a simple face. However, some species have multicolored faces, which help identify friends and enemies.