Do you know why we are able to see light and hear sound? What is the Earth made of? How does the body produce energy? And, most important, does any of this matt

I Used To Know That: General Science is an easy and accessible trip down memory lane, helping you remember all those useful things from school which you have no

Why does matter matter? What makes the earth quake? Why does the moon shine? With I Wish I Knew That: Science, kids will learn the answers to hundreds of fascin

Basic information about science for young children, arranged in five chapters.

It can be difficult to keep different historical events and figures straight in your head, which is why I Used to Know That: World History presents major episod