¡Todo lo que mola de los tiburones y otras criaturas submarinas!

Children explore the concepts of big and small in the world around them, from big round pancakes to tiny little seashells.

This book gives students an in-depth look at how large telescopes work. The wonder and awe of space and the scientific instruments we use to study it both come shining through in this fascinating book. Full-color diagrams and illustrations will help students visualize how the technology of telescopes works. Students will learn about the creation of mirrors 8 meters wide and telescope teams that work together to create a telescope as powerful as if it had a mirror the size of the Earth!

Rhyming verse describes the good food, decorations, and stories when grandmother arrives for the annual celebration of the Mexican holiday, Day of the Dead.

When President Thomas Jefferson bought the Louisiana Territory from cash-strapped France in 1803, he doubled the size of the United States without really knowing what he was getting. He dispatched Meriwether Lewis and William Clark and their Corps of Discovery to explore a territory that would include part or all of fifteen future states and to seek a water route to the West Coast. Westward expansion began immediately, all for the bargain price of 15 million dollars. This book richly explores this fascinating part of history.