We use many different tools to measure the size of different things.

This is a book about some important monuments in the U.S.A. What are some historic monuments?

Lucille wants to learn, and Mary McLeod Bethune wants to open a new school for girls like her. Will they be able to work together to open their school?

We can often choose to make things or buy things. But what kinds of things can we make or buy? And what are our reasons?

Sunlight is necessary for life. Artificial light is also important. You can read many things about light in this book.