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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!

Going green does not need to be a sacrifice, either for us as individuals or for businesses, governments and the economy.

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."

Earth has a flag... and its story will move you.

The efforts to save the Amazon rainforest actually did save it. However, new threats have arisen to combat conservation efforts.

After a life-changing epiphany in 2009, Ravi Singh, along with his wife Jacquelin, started Share a Meal, a non-profit program that delivers fresh meals to the homeless on Los Angeles' Skid Row. For five days a week, the Sikh man and his team of volunteers make and deliver hundreds of vegan burritos out of their food truck as a way to serve and share with the community. Out here, it's more than just a free meal - it's a way to show others that they have not been forgotten.

When Ryan Hickman was just 3 years old, he went with his father to recycle for the first time. After sorting his bottles and cans, he became obsessed with recycling, and how it can help save the environment, and decided to start his own business - Ryan's Recycling Company. Now 7, Ryan has disposed of more than 200,000 bottles and cans and earned about $21,000. It's all in a hard day's work.

The ten countries that recycle the highest proportion of their municipal waste.

In an interview with Quartz editor-in-chief Kevin Delaney, Bill Gates explains why robots that take jobs away from people shouldn't get a free pass when it comes to income tax.

We live in a time where we quickly put people in boxes. Maybe we have more in common than what we think? Introducing All That We Share. The English version.

We are trapped on earth. Controlled by an ancient debt to the universe...

Imagine you're watching a runaway trolley barreling down the tracks, straight towards five workers. You happen to be standing next to a switch that will divert the trolley onto a second track.

Why we can't seem to agree on what's true when it's easier than ever to check.

Have you ever sat in a doctor's office for hours, despite having an appointment?

After witnessing the "violent rage" shown by babies whenever deprived of an item they considered their own, Jean Piaget - a founding father of child psychology - observed something profound about human nature: Our sense of ownership emerges incredibly early.

Happy New Year everyone! Wish you all a bright and fruitful 2017.