SciShow
This Jawless Fish Could Help Treat Brain Diseases
You might expect to find these fish at the core of an ancient, distant asteroid, but we find them instead on Earth. That doesn’t mean they aren’t special, though. In fact, their immune systems may be the key to unlocking a new treatment...
Visual Learning Systems
What Is a Fish?: Different Types of Fishes
This lively video investigates the wide, colorful assortment of fish found on the planet. Concepts and terminology: saltwater, freshwater, cold-blooded, fins, backbone, eggs, scales, and gills.