From Egyptian pyramids to Mayan temples, from Roman statues to the English language, our world's greatest empires still influence us today. This reader examines the history and legacy of several of the most influential empires. Use your unique code to access the online reader, complete with videos and interactive exercises. Plus, download a free e-book version of the reader!

Determining the greatest invention of all time invites the greatest debate. From the internet to antibiotics, this reader explores our most significant contributions to education, technology, medicine, and transportation.

Do you remember being a baby? When are you grown up? Learn how humans and animals grow from babies to adults, and what it means to be an adult in different cultures. Use your unique code to access the online reader, complete with videos and interactive exercises. Plus, download a free e-book version of the reader!

Cold places, cold-blooded animals, catching a cold, getting cold feet — how many ways are there to be cold? Use your unique code to access the online reader, complete with videos and interactive exercises. Plus, download a free e-book version of the reader!

Doctors today don't use leeches. Long ago, there were no big drug companies. But acupuncture, an ancient practice, is still helping people. Follow how medicine has — and has not — changed over time. Use your unique code to access the online reader, complete with videos and interactive exercises. Plus, download a free e-book version of the reader!

What does the word hot mean? From the Sahara Desert to heatstroke, from temperature to emotions, learn how heat affects our world. Use your unique code to access the online reader, complete with videos and interactive exercises. Plus, download a free e-book version of the reader!

The ancient world had seven wonders — amazing things made by people. Today, people don't agree about what the biggest wonders are. What do you think is a wonder? Use your unique code to access the online reader, complete with videos and interactive exercises. Plus, download a free e-book version of the reader!

Cambridge Discovery Education Interactive Readers are the next generation of graded readers — captivating topics, high-impact video, and interactive exercises designed to motivate and engage. Alaska is one of the most beautiful places on Earth. It's also one of the most dangerous. Mountains, bears, glaciers, and dog sledding: explore the natural beauty and unique way of life in this US state. Use the unique code inside the book to access the online reader, complete with videos and interactive exercises. Plus, download a free e-book version of the reader!