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Symmetry is about way more than splitting circles: It's change without change, and it has applications throughout mathematics, physics, and nature.

Playing games in school develops the kind of social and emotional skills that translate to adult success.

Much to the chagrin of NASA rocket scientist Dr. Wernher von Braun, President Richard Nixon chose instead to greenlight the space shuttle program because it intrigued the military-industrial complex.

Jim Gilliam tells how the Internet saved his life — literally! — and how unprecedented connectivity is shifting the global community in chaotic, exciting ways.

Most likely not, though Bill's not ruling it out completely.

Photojournalist Lynsey Addario believes in the power of images. They engage in a way text and writing can't. That's why photographs are so vital in educating the public about conflicts, war, poverty, and other troublesome issues worldwide.

Does the typical college student understand the sort of mental health care options available to her? Dr. Victor Schwartz of The Jed Foundation continues our series "Big Thinkers on Mental Health."

Are your family trips an exercise in pleasure or comfort? Behavior economics guru Dan Ariely notes that there's a vivid difference between the two… and it may mean the difference between a fantastic vacation and one that's just okay.

People with disabilities shouldn't have to try and pass as able in the workplace, says writer and comedian Maysoon Zayid. But the sad reality is that America's largest minority remains invisible throughout popular media.

Inequality in America has risen since the 1980s, but robust democratic institutions can turn this trend around.

To what extent are you "yourself" at work? Renowned legal scholar Kenji Yoshino studies the phenomenon of "covering."

Establishing a colony on Mars would protect the long-term survival of the human race.

This week's question arrives from the Philippines, courtesy of Amy. Bill dissects the question before giving several possible answers.

Ian Bremmer calls Hillary Clinton a "moneyball" candidate for president.

Dr. Christine Moutier of the American Foundation for Suicide Prevention continues our series "Big Thinkers on Mental Health" with ways society can combat the rising suicide trend.

Moving past racism "is about respecting and reveling in the humanity of every other fellow citizen."

That's right… giant parsnip steak. Sound appetizing? In this video, chef Dan Barber explains why it's important to cook your food using a diverse array of natural ingredients from your local environment.

Once you have that kind of ability to relate to your own situation with kindness, says Thupten Jinpa, it creates a kind of a reservoir of strength and resilience so that you have plenty to draw from.

Emotions can cloud our rational decision-making. By adopting the perspective of an outside advisor, psychologist Dan Ariely says we can inject some rationality into our cognitive processes.

Rising high school senior Wesley asks Bill for career advice. The Science Guy delivers.