A mechanical device that produces motion in some kinds of airplanes or ships. A propeller consists of two or more twisted blades that rotate around a central hub. As the propeller spins, air or water is pushed in one direction, pushing the craft in the opposite direction. [Propeller comes from…

Explore Science Dictionary

Seymour Science Blog

Seymour Simon’s striking new book, ROCKS AND MINERALS, is being published on August 15th (available for pre-order now on Amazon). Here’s an interview with Kirkus about his connection to rock-hounding, the process of making this book, his views on teaching…

Seymour Simon on Facebook and Twitter Become a Seymour Simon Facebook Fan Follow Seymour's field notes and photos