Alexander Graham Bell opened the doors to improving telecommunications between humans. He invented the telephone and the inventors after him kept making new and

Waves move differently. In this book, your third grader will be learning about the sound waves - how they move and how they travel across different surfaces. At

What do record players, batteries, and movie cameras have in common? All these devices were created by the man known as The Wizard of Menlo Park: Thomas Edison.

This is a biography of the teacher and inventor best known for his work with the deaf and his invention of the telephone.