All mammals—dogs, sea lions, and even you—have an adaptation for surviving in cold water. Take the plunge, and learn why the mammalian diving reflex is your cold-water friend.

Explore the ocean's depths. Make your own diving bird mobile or Treasure Island map. Discover what sharks eat—and how it tastes. And set your mind afloat with these 12 kid-friendly books.

The next time you have chicken, don't throw out the bones—bury them in plaster of Paris. Then, scrape by scrape, see firsthand the challenges archaeologists face when excavating fossils.

Don't just jot down your notes and ideas on plain paper. Showcase them alongside the musings and insights of Albert Einstein with these colorful, ready-to-print PDF stationery files.

Did you know sound moves five times faster in water than in air? Or that cleaner fish have "cleaning stations" where they remove parasites? Deepen your knowledge with this ocean life challenge. 

Hide your notes in seaweed, send a deep-sea snapshot, or let an cockeyed squid deliver your message. Just add your name and address to these colorful stationery files.

Most living things never become fossils. And most of the fossils created will never be found. Learn more about these extremely rare—and valuable—records of the past. 

Type your notes next to T. rex, send letters via Diatryma, or let Gondwanatitan deliver your message. Just add your name and address to these colorful stationery files. 

You don't have to be a professional paleontologist to collect the remains of ancient life. Anyone can find fossils. This handy how-to guide tells you where to look and what to do.

How much do you know about our watery world? Find out with this interactive quiz. Here's a hint to get you started: The greatest diversity of life on Earth is NOT found in your bathroom!