The Princeton Field Guide to Sauropod and Prosauropod Dinosaurs Slime & Putty Explore lessons in physics and

Explore lessons in physics and math by experimenting with gears

Perfect for adding to bedtime routines or carrying along for entertainment on the go

A compelling

Amethyst: quartz colored by iron and irradiation

and dynamic prehistoric scenes

The Princeton Field Guide to Sauropod and Prosauropod Dinosaurs Slime & Putty Explore lessons in physics andAn authoritative illustrated guide to the long necked herbivores that roamed the dinosaur world, from the enormous Brontosaurus and Brachiosaurus to their prosauropod ancestors New discoveries are transforming our understanding of the sauropod and prosauropod dinosaurs, revealing startling new insights into the lives and look of these awesome herbivores. The Princeton Field Guide to Sauropod and Prosauropod Dinosaurs provides the most up to date and