Böcker av Kathleen Weidner Zoehfeld

"A nonfiction "biography" of the light bulb from the electric precursors like the arc lamp to Thomas Edison's invention and beyond to current innovations in light bulb technology"--

Millions of years ago, dinosaurs left their footprints all over the earth. With each discovery of a dinosaur footprint, ichnologists—scientists who study dinosaur tracks—learn more about these ancient creatures and the world they lived in. Read and find out how to step back into history through the footprint of a dinosaur.

Some dinosaurs were big. How big? As long as four school buses in a row, as heavy as sixteen elephants. Some dinosaurs were small. How small? Read and find out!

Are you like a cat?You don't look like a cat. But you and a cat have something in common: You are both alive. People and plants and animals are all alive, but is a doll alive? Or your tricycle? How can you tell? Read and find out what makes something alive, and what all living things need to stay healthy.

Did Dinosaurs Have Feathers? Birds have feathers, but did you know some dinosaurs did too? New fossils have shown that as long as 145 million years ago, some dinosaurs had feathers, just as birds do. The birds you see outside your window are relatives of these ancient creatures. Ages 5-9

The perfect book for dinosaur lovers-travel back hundreds of millions of years, stopping in frozen ice ages, lush prehistoric rainforests, and ancient oceans along the way.

National Geographic Primary Readers is a high-interest series of beginning reading books that have been developed in consultation with education experts. The books pair magnificent National Geographic photographs with lively text by skilled children's book authors across four reading levels.

National Geographic Primary Readers is a high-interest series of beginning reading books that have been developed in consultation with education experts. The books pair magnificent National Geographic photographs with lively text by skilled children's book authors across four reading levels.

When the pharoahs of Egypt died, they were mummified and buried in pyramids and tombs with all their riches. But as centuries passed, the tombs were looted and the pharoahs' gold stolen. Then Howard Carter found the greatest Egyptian treasure trove of all—the tomb of King Tut's mummy! But did the amazing treasure come with a deadly curse?