Sixty-six million years ago, near what’s now the Yucatán Peninsula, a juvenile sauropod feasted on horsetail plants on a riverbank. Earth was a tropical planet. Behemoth and tiny dinosaurs alike soared its skies and roamed its lands...

The laws of physics don’t specify an arrow of time - they don’t distinguish the past from the future. The equations we use to describe how things evolve forward in time also perfectly describe their evolution backwards in time. So the...

It was pretty impressive when LIGO detected gravitational waves from colliding black holes. Well we’ve just taken that to the next level with a galaxy-spanning gravitational wave detector that may have detected a foundational element of...

Is all that exists just whatever exists right now? Is the past erased and the future a void yet to be filled? Well, the answer lies in between the past and the future - in the elusive, ever-moving eye-blink that we call the present.

Could it be that all the electrons in the universe are simply one, single electron moving back and forth through time?

Now that gravitational waves are definitely a thing, it's time to think about some of the crazy things we can figure out with them. In some cases we're going to need a gravitational wave observatory - in fact, we've already built one.

Poet C.K. Williams reads his work at TED2001. As he colors scenes of childhood resentments, college loves, odd neighbors and the literal death of youth, he reminds us of the unique challenges of living.

Austrian physicist Erwin Schrodinger, one of the founders of quantum mechanics, posed this famous question: If you put a cat in a sealed box with a device that has a 50% chance of killing the cat in the next hour, what will be the state...

Although much of the Big Bang Theory is widely accepted to be true, it only gets us part of the way there. Observable truths such as the CMB and the flatness of our universe reveal that there is no way the universe has been expanding at...

We pretty much know for sure that the universe was once extremely small, and extremely hot. And we know that something set it in motion, expanding rapidly and continuing to do-so today. But the actual moment of 'the Big Bang' is still a...

Howcast - See something interesting while watching a C-SPAN video and want others to see it, too? C-SPAN makes it easy to clip the exact portion you want, and share it with friends or embed it on a website or blog. Just follow these...

Howcast - C-SPAN, the cable network that covers Congress and public policy in Washington and around the country, now gives you free online access to its video dating back to 1987 with its new Video Library. Here's a crash course in...

Howcast - Whether you missed the latest presidential speech or want to research a Congressional hearing from 20 years ago, the new C-SPAN Video Library can connect you to the national political debate -- on your computer, in an instant....

Featuring all new climbing material, logs, and lush plants, it's everything a panda could love. See them put on a great show.

Have you ever wondered how long it takes your teachers and professors to make their slides for class? Well it can be instant or months. #askaprofessor #professorlife #college Help Support Free Online Education