This looks like something out of a video game, but it's for real. Some parkour masters can scale a building by jumping back and forth between two facing vertical surfaces, zigzagging upward. Seriously, check it out right now, I'll wait. (It's the move that starts at 0:10 in the clip.) …

Have you ever sat on the bottom of a swimming pool and pondered your watery ceiling? Most of the surface is a sheet of light blue, and you can't see through it, even though the water is clear. But right above you, there's a round window of transparency. And here's …

To be an Olympic champion, athletes spend years perfecting every aspect of their performance. That same attention to detail goes into the sleek, lightweight uniforms they wear, because at this level the tiniest of advantages can affect the outcome. So what's up with all the high-fashion hair and flashy accessories …

Catch it live: The Men's Long Jump Final at the Paris Olympics will be held on Tuesday, August 6, at 2:20 pm ET. The Women's Final is on Thursday, August 8, at 2 pm ET. Whether an athlete wins gold or silver at the Summer Olympics can turn on the …

At a recent rally, Donald Trump stated that electric planes would be a bad idea because you couldn't fly if it was cloudy. I guess “electric” equates to “solar energy” in the former president's mind—which, you know, is actually great. Just … not so much for air travel. Oh, solar …

In the future I'm sure there will be a city on the moon. We know how to get there, it's super close, and it could be great for further space exploration. However, there's a problem with living on the moon for any length of time: the weak gravitational field, which …

Theres a famous star that I'm sure you've seen in the sky. Its name is Betelgeuse, and you can find it in the Orion constellation, where it marks Orion's right shoulder. If you want to call it “Beetlejuice,” I'm fine with that so long as you don't say it three …

Climate change. It’s bad, and it’s getting worse. The main cause is burning fossil fuels, which spews CO2 into the atmosphere. Carbon dioxide, as we all know too well by now, is a greenhouse gas, meaning it absorbs heat radiation from the Earth, preventing it from escaping out into space. …

The aurora borealis is usually visible only way up north, but two weeks ago the night sky was filled with shimmering curtains of pink and green light that could be seen all the way down into the southern US. People in Texas and Hawaii got out of their cars to …

When you think of Star Wars, what's the first image that comes to mind? Lightsabers, right? Everyone loves lightsabers. You can buy some nice replicas, and there are even classes on lightsaber training. But what about an actual working lightsaber? What it would take to make a real one? Today, …