David Armentrout

"¡Los cachorros son tiernos! ¡Los cachorros son abrazables! Descubre cómo aprenden, trabajan, juegan y crecen para convertirse en adorables miembros de una familia"--Back cover. "Learn all about Labrador retriever puppies! Discover fascinating facts: what three colors are most labs, do they like being in the water, and why are they called retrievers"--Provided by publisher.

"¡Los cachorros son tiernos! ¡Los cachorros son abrazables! Descubre cómo aprenden, trabajan, juegan y crecen para convertirse en adorables miembros de una familia"--Back cover. "Learn all about French bulldog puppies! Can you guess which country this breed comes from? Discover fascinating facts: what is a nickname for French bulldogs, how many puppies are in the average litter, and what is their favorite game"--Provided by publisher.

Defines screws, explains their functions, and suggests simple experiments to demonstrate how they work.

Defines wedges, explains their functions, and suggests simple experiments to demonstrate how they work.

Defines levers, explains their functions, and suggests simple experiments to demonstrate how they work.

Defines inclined planes, explains their functions, and suggests simple experiments to demonstrate how they work.

A biography of the woman who founded Hull-House, one of the first settlement houses in the United States, and who later became involved in the international peace movement.

Follows the life and career of the French scientist who proved the existence of germs and their connection with diseases.

"Find out how far away the Moon is, why it seems to change shape, and who the first person was to walk on the Moon."--Provided by publisher.