Praise for the previous edition:"e;...well-developed...clear and detailed...useful at the sec...

Praise for the previous edition:SSLI "e;Honor Book,"e; Science, Grades 712 categorySociet...

Composed of the heart, blood vessels, and blood, the circulatory system delivers oxygen and nutri...

Cells are the smallest units capable of sustaining life, and they make up virtually every aspect ...

A great deal of what is known about genetics and inheritance is thanks to what has been learned b...

Until John Wilkes Booth killed Abraham Lincoln, the assassination of a U.S. President was conside...

Why are some people lactose intolerant? What happens to the brain during and after a concussion? ...

Computers and technology play central roles in our lives for work, entertainment, communication, ...

Explore the human body from head to toe with fun facts for ages 9 to 12Human bodies come in man...

Praise for the previous edition: '...well-developed...clear and detailed...useful at the secondar...

Explore the human body from head to toe with fun facts for ages 9 to 12Human bodies come in man...