What are the health benefits of laughter? What is happening in the brain when you're in love? What are the effects of isolation on the mind? Find out in these articles about human emotion.

Dark, cloudy skies and the drumbeat of raindrops on our windows tend to make people feel sad and forlorn, or at least that's what we have come to assume.

What do Donald Trump, Bob Dole and LeBron James have in common? A tendency to talk about themselves in the third person. But is it just egotism or is there a hidden benefit to saying your name rather than "I"?

The Scandinavian countries tend to come out on top in the World Happiness Report. But the report doesn't actually ask participants if they're happy. When that question is included, the country rankings are quite different.

It's already a scary world. Why do we seek to experience more fear?

Yes, there might be another reason we reach for expletives when we're under stress.

Empathy is an important emotion that enables healthy relationships and fosters the development of a safe, secure world. But what happens when someone has too little — or too much?

The recent unsettling spate of clowns disturbing America isn't the first time freaky greasepaint bozos weirded people out.

New book says mental exhaustion has been with us since antiquity.

If you're watching someone embarrass themselves on TV, it might make you squirm or even change the channel. But hey, at least you're empathetic.

A good guffaw involves way more than just sputtering a few hearty hee-hees.

Here's a hint: You're more likely to find one haunting a backroom than an attic.

Your stomach is growling, your boss is demanding and the cereal you ate for breakfast is a distant memory. Could having a little snack save you from (unwisely) screaming at your supervisor?

No one likes being told they've done wrong, whether it's from a boss, spouse or parent. How can you do a better job of giving "constructive criticism" without coming across as obnoxious?

Most people would recall every detail of being held up in a bank robbery but not so well the details of their last birthday party. The brain is wired for recalling trauma for a very good reason.

Aristotle defined hate as a dislike so intense that whoever feels it wants to cause another person real harm. What is going on in our brains when we hate? And can hate ever be a good thing?

Scientists know that the brain's reward center teaches humans that certain behaviors lead to pleasure, but what about those that lead to pain? A clue lies in the fact that pain isn't just a physical sensation, but an emotional and psychological one as well.

There's no doubt that humans are a violent species. The real question is: Why? Are some people wired differently than others? Is it a matter of survival? Or are we just taking our frustrations out on others in violent ways?

It's hard to say what makes people happy because we are all very different. It also could be a lot of things, such as health, relationships at home, hobbies or spirituality. View pictures of people in the pursuit of happiness here.

We hear news of violent acts of all sorts committed by humans every day. But how do we become violent? Is it something we learn, or are people violent at birth? And is there anything that can stop it?

Why do we help others, even if we know it will hurt us? As it turns out, the concepts of altruism and selfishness may be linked -- much more so than we thought.

What makes you happy? If you're not sure, and especially if you're not happy, read on to learn more about how to pursue the happiness you desire -- and deserve.

Why do we get mad when we get hit, or get sad when we're disappointed? Are the emotions we feel physical responses to our environments or manifestations of physical changes? There's a lot less debate on the subject than you'd think.

You think you'd know what happiness was -- you've felt it before, right? Not quite. It turns out that the definition of happiness pretty much depends on who's defining it.

Humans can express emotion in a variety of ways, from the written word to spoken communication. But what is it about music and art in particular that has the power to move us?

Studies seem to indicate that men are more likely to harbor violent tendencies than women. What factors do researchers use to come to these conclusions, and most importantly, is it true that men are more violent?