It’s been over 200 million years since South America broke off Africa into its own continent. But now it’s behaving very strangely. It’s taking on water and going down...
Imagine being able to travel to any point in time. Where would you go, and what would you do? You could witness some of the greatest moments in history or even change...
Everyone assumes more trees means a cooler planet. Plant enough of them and the temperature comes down. The Sahara might prove that assumption wrong in the most...
It sounds impossible today, but in the 1930s, a Nazi movement existed inside the United States. While Nazi Germany was rising in Europe, American supporters of Adolf...
If you could travel back roughly 250 million years, you would not see the Earth you know today. Instead, you would arrive at the very beginning of the dinosaur story...
Few environments on Earth are as unforgiving as the desert. Humans are built to survive within a fairly narrow range of temperatures, and we depend on a steady supply of...
A scorching hot never-ending day on one side and a permanent frozen night on the other. This is what our planet would be like if it was tidally locked to the Sun. How...
In 1967, NASCAR driver St. James Davis traveled to Tanzania, Africa, expecting to return home with unforgettable memories from his journey. Instead, he witnessed...
But how would a second moon affect the ocean tides? Would months on Earth become longer or shorter? And would these two satellites inevitably collide to cause a...
Earth depends on countless natural systems working together. The atmosphere, oceans, land, and living organisms constantly influence each other, creating the conditions...
Serving and protecting the United States is a big responsibility. But its seven services have things covered, even outer space. Tonight it’s sea versus sky as we...
The numbers are hard to ignore. According to United Nations assessments, the world has roughly a decade to make dramatic cuts in greenhouse gas emissions if it hopes to...
First off, we’re going to have to be a Type 1 civilization. Then collectively, we can use all the energy available on our planet. It also gets rid of the monotony of...
Ever wonder what it would feel like to step into an oven? Welcome to Death Valley, California. It’s so hot you can barely breathe. This national park that stretches...
We sure love our roads. We love them so much that we seem determined to pave the entire world. But maybe roads can become the future of renewable energy. That’s right...
Imagine that the Sun is on the verge of exploding. Or that a planet-killing asteroid is headed our way. Or maybe you just want to take the entire planet on a joy ride...
In the mid 1880s, a hardworking lamplighter in New York came up with an unusual solution to a problem that could have cost him his livelihood: oversleeping. Sam...
An asteroid races towards Earth. In 6 months, the world as we know it will be obliterated. What do you do? Is there time to evacuate? What would it take? And where would...
The most deadly predator of the sea spent its days conquering and terrorizing every creature in sight. This is the megalodon. It lived millions of years ago, but imagine...
Take a deep breath. We take 23,000 breaths a day; trying to get oxygen to our brain and cells. Oxygen is essential to our survival. But it’s a only small...
