Scientists found that the monkeys would intentionally sabotage other monkeys who got more food than they did.

PSYCHOLOGY
Feeling overwhelmed? Grab a pen.
Letting your mind wander helps consolidate memories much like sleep does, according to a new study.
People with highly superior autobiographical memory can recall dates and events from decades ago as if they just happened.
During the holidays a lot of people are unwrapping presents, but unboxing is phenomenon that is popular year-round.
Flotation REST is a form of sensory isolation that some researchers say could treat chronic pain, anxiety, and more.
Praise from friends and family not only makes us feel good, it actually improves our problem-solving skills.
Turns out, our individual experiences shape how we perceive physical attractiveness.