In October, the first mission of the ExoMars program arrived at the Red Planet, and things didn't go exactly as planned. As NASA investigates the crash, the mystery unfolds.

Scientists conduct some pretty cool research experiments for Mars here on Earth. These terrestrial analogues have revealed some incredible discoveries!

You might want a really sturdy umbrella to dig into this video, because we’re discussing 5 animals that have a tendency to rain down from the sky and the reasons we think this might be happening!

Learn about some cool, chilly, spaces with Jessi and Squeaks!

Robert Neuwirth spent four years among the chaotic stalls of street markets, talking to pushcart hawkers and gray marketers, to study the remarkable "System D," the world's unlicensed economic network. Responsible for some 1.8 billion...

The ground beneath your feet is home to a massive, mysterious world of microbes -- some of which have been in the earth's crust for hundreds of thousands of years. What's it like down there? Take a trip to the volcanoes and hot springs...

Caves are fascinating, but these ones are some of the most fascinating, both in and out of this world.

It sounds like science fiction, but journalist Stephen Petranek considers it fact: within 20 years, humans will live on Mars. In this provocative talk, Petranek makes the case that humans will become a spacefaring species and describes...

One of the strongest rocks in the world is one that you might not expect, and the story of how it formed deep under the earth is intense!

When living underground leaves them vulnerable to attack, burrowing owls have a trick up their sleeve—they’ve developed the ability to mimic rattlesnake sounds that scare off predators!

Potatoes are amazing! You can make them into french fries, baked potatoes, hash browns, potato chips, and tons of other tasty foods! And best of all, they're super easy to grow! Join Jessi and Squeaks to learn how!

NASA's Cassini spacecraft has detected a huge ocean under the surface of Saturn's moon Enceladus. But how? And what does it really mean? Hank lays out the data -- straight from space to your brain!

Hank noticed something mysterious in the park one day. Fairy rings: are they mystical portals to another realm? Or could there be another, more scientific, explanation?

Spray-painted subway cars, tagged bridges, mural-covered walls -- graffiti pops up boldly throughout our cities. And it turns out: it's nothing new. Graffiti has been around for thousands of years. And across that span of time, it's...

February 2nd is Groundhog Day in the United States, and Jessi and Squeaks are celebrating by sharing all kinds of amazing groundhog facts with us! Learn what groundhogs eat, where they live, and how they make it through tough winters!

New ReviewHarriet Tubman plays a vital role in the Underground Railroad, guiding slaves to freedom despite her fears. The journey involves secret pathways created by abolitionists and freed slaves, with constant danger from slave catchers. Tubman...

Simon Calder travels around London by Tube on a day Underground workers are on strikeSource: The Independent

Howcast - Life on the surface feeling kind of shallow? Check out these tips on how to live underground!

Howcast - Check out part 45 and travel to the Shroud Facility on Tuchanka in this walkthrough of Bioware's new release, Mass Effect 3.

Howcast - See the ending and post-credits scene of Binary Domain, the squad-based third-person shooter from Yakuza Studio.

Simon Calder: Rail and tube disruption resumes today and is set to continue until early August.

Simon Calder: Rail and tube disruption resumes and is set to continue until early August.

You can also see the ants' underground nest at the Children's Zoo at San Diego Zoo, something you wouldn't be able to see in the wild.

Hidden underground tunnel system built by Incas found beneath CuscoSource: Various