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We spend an inordinate amount of time thinking about, and in various ways 'styling' our hair. It's not entirely silly; we're trying to tell the world - through the language of keratin strands - about who we are.

You may know exactly what race you are, but how would you prove it if somebody disagreed with you?

It's sometimes assumed that talking too much about ourselves is rude; and asking questions of others is polite and charming. But the distinction is not quite so simple. There are far better and worse ways of speaking about ourselves. We end up charming when we dare to reveal our vulnerabilities to others.

Most people think the apocalypse would bring violence, crime, and selfishness. But according to scientists, that's just not realistic.

In a very short amount of time the human population exploded and is still growing very fast. Will this lead to the end of our civilization?

What vending machines can teach you about this country

Why do humans cook? Holidays are celebrated in many ways, but chances are they involve eating, and eating a LOT. Ever wonder why we cook our food? We do it because it tastes good, of course, and because our customs and traditions are built around it. But we also cook our food for some basic biological reasons, because of evolution. Some scientists think that figuring out how to cook actually MADE us human! If conversation gets a little dry around your holiday table, now you'll have some awesome science to share with everyone!

GPS services have made getting from point A to point B a lot easier, but what effects does this have on our brains?

Today, 96% of American consumers own at least one pair of jeans. But where did these durable duds come from? And how did they get so popular? Jessica Oreck shares the humble origins of blue jeans.

Children who develop remarkable skills at an early age are often knowns at prodigies, but what happens to these kids once they grow up?

Laughter may be contagious, but did you know rudeness is too? Is there a way to stop bad attitudes from spreading?

Some people in high school engage in risky behavior, such as drinking and smoking, in an attempt to be cool. Does this pay off long term? Join Tara as she reports on new research showing that being popular in high school might be bad in your adulthood!

Why are some people racist, but others are not?

Lissa Rankin, MD is an OB/GYN physician, author, keynote speaker, consultant to health care visionaries, professional artist, and founder of the women's health and wellness community OwningPink.com. Discouraged by the broken, patriarchal health care system, she left her medical practice in 2007 only to realize that you can quit your job, but you can't quit your calling. This epiphany launched her on a journey of discovery that led her to become a leader in the field of mind/body medicine, which she blogs about at OwningPink.com and is writing about in her third book Mind Over Medicine: Scientific Proof You Can Heal Yourself (Hay House, 2013).

Friendliness is a great virtue. Over-friendliness can be an unexpected problem.

Sport stacking, cup stacking, speed stacking - whatever you call it, this sport is mesmerizing to watch. Vox's Phil Edwards learned the basics about stacking.

We may have reached "peak beard."