propeller:

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…

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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…

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