Humans have harmlessly harvested coral reefs for thousands—or even hundreds of thousands—of years. So why has our behavior in recent years suddenly put reefs at risk?
By taking biopsy-like samples from centuries-old Siberian pines, scientists have reconstructed a 300-year record of temperature changes for the Arctic and the Northern Hemisphere.
Take a world-wide tour of biodiversity. You'll meet mollusks in the reefs off the Bahamas, the aye-aye in the tropical forests of Madagascar, and the clever mimic-ant spider that lives in Australia.
The ocean's one diverse place—with alga so tiny that 10 million can fit in a single teaspoon to whales longer than three school buses. Take the surfboard challenge, and ride the waves of biodiversity!
Did you know that forests with leaves above the water can grow in the ocean? Grab the magical magnifying glass, and see how many different plants and animals you can find in this virtual mangrove swamp.
To survive in the icy Pacific, a sea otter has about a million hairs in every square inch of its fur. Now, that's dense! Take a close look at ocean adaptations while boosting your OLogy card collection.
Which squirmy little creatures does the spiny lobster eat? Can you spot the weird greenish glow on the belly of the cookie-cutter shark? Show off your good thinking with a game of good linking.
Huge distances, gigantic sizes, and long periods of time—astronomy is a BIG subject. We've brought learning about it down to size with this look at the big ideas you need to know.
That change jangling in your pocket is more than money—it's a record of where and when you live. Find out why coins are valuable clues for archaeologists. Then, design your perfect coin.
Unlike humans, some animals can instantly change the color or pattern of their skin. Take a hands-on look at how the masters of disguise known as flounders can don several different looks.