When Fish Wore Armor

When Fish Wore Armor

420 million years ago, some fish were more medieval. They wore armor, sometimes made of big plates, and sometimes made of interlocking scales. But that armor may actually have served a totally different purpose, one that many animals still use today. video courtesy of...
The Return of Giant Skin-Shell Sea Turtles

The Return of Giant Skin-Shell Sea Turtles

The biggest turtle ever described wasn’t an ancestor of today’s leatherback turtles or any other living sea turtles. But it looks like there are some things about being a giant, skin-shelled sea turtle that just work, no matter where, or when, you lived. video...
When Ichthyosaurs Led a Revolution in the Seas

When Ichthyosaurs Led a Revolution in the Seas

The marine reptile Ichthyosaurs arose after The Great Dying, which wiped out at least 90 percent of life in the oceans, changing the seas forever and triggering a new evolutionary arms race between predator and prey. video courtesy of PBS Eons
Focus on elementary geology

Focus on elementary geology

Written for children in grades K-4, this textbook introduces basic concepts of geology, including rocks and minerals, basic structure of the Earth, volcanoes, earthquakes, the water cycle, and Earth’s magnetism. This primer is available in student and teacher versions...