You can find bears on every continent other than Antarctica and Australia. But most of the 8 species of the Ursidae family live in the northern hemisphere.
Meet this "small group of mostly large mammals" that all have small, rounded eyes and very short tails — and find out why they're often the top predator in their ecosystems.
A fancy car purrs to life. It's hard to believe that inside the engine, violent explosions are going off thousands of times a minute.
Turning heat into motion, internal combustion engines have come a long way in the last 150 years. In different forms, they now power not only cars, but jets and rockets. True, they pollute. But, as you’ll see here, they may still have a long way to go.
Feeling a little cramped? There's plenty of room beneath the ocean's surface — in fact, there you'll find 95% of Earth's living space.
How deep is deep? Well, you could hide 20 Washington Monuments stacked atop each other. And what lives in this perpetually dark place? More than we know. Explore a world that's also deep in mystery.
When a full moon, the Earth, and the sun are exactly aligned, we might be lucky enough to witness a lunar eclipse. That’s when the Earth blocks sunlight, and the moon slips into our planet’s shadow.
Investigate the three types of lunar eclipses, including what makes each happen, why one kind is really rare, and why the moon might glow a faint red.
Icebergs are freshwater ice floating in seawater. Roughly 1/9th of the ice is actually visible above the surface of the water — the rest is lurking out of sight.
Icebergs can be unstable and hazardous. How are icebergs made? How big can they be? And how long can an iceberg float? Get the details.