What If the Sun Swallowed Earth?

The Sun’s core is shrinking. But as its core shrinks, the Sun itself grows larger. And it will continue to grow, until one day, it engulfs the Earth. How long can you...

What If We Had Flying Cars?

Imagine an entire network of flying cars zooming around 2,000 meters (6,561 feet) above our congested city streets. Your morning commute would be a lot different up...

What If Pangea Never Broke Apart?

Millions of years ago, the Earth looked very different. A huge landmass, called Pangea, covered about a third of our planet. But about 175 million years ago, the Earth...