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. Word count: 1715.

What do you really know about the sense of hearing? Learn all about the science of sound, the crazy noises animals make, and the loudest and quietest places on Earth. Use the unique code inside the book to access the online reader, complete with videos and interactive exercises. Word count: 1577.

In the style of a travel guide, this reader shows you some of the best things to do and see in this amazing island nation. Explore the Tsukiji fish market, Mount Fuji, and traditional Japanese theater. Use the unique code inside the book to access the online reader, complete with videos and interactive exercises. Word count: 1309.

Sharks, puffer fish, polar bears, and the world's deadliest animal - the mosquito. Learn all about deadly animals, both big and small. Use your unique code inside the book to access the online reader, complete with videos and interactive exercises. Word count: 1598.

Why do we need sleep? What if we get too little or too much? Explore the mysteries of the night - like what really happens when we sleep! Use your unique code inside the book to access the online reader, complete with videos and interactive exercises. Word count: 1679.

How fast is fast? Humans, cars, animals: they all have the ability to go fast. Come explore the many ways we can speed. Use the unique code inside the book to access the online reader, complete with videos and interactive exercises. Word count: 1797.

Do animals eat the way we do? Explore how cows and rabbits, seahorses, koalas, sharks, and more eat in ways that can be very, very strange to us. Use the unique code inside the book to access the online reader, complete with videos and interactive exercises. Word count: 1608.

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 inside the book to access the online reader, complete with videos and interactive exercises. Word count: 1595.

One of the most heavily populated cities in the world, Mumbai is the center of India's culture and technology. This reader takes you through a day in the life of an average Mumbai citizen as he experiences the public transportation, the workplace, the food, and the entertainment of Mumbai. Use the unique code inside the book to access the online reader, complete with videos and interactive exercises. Word count: 1394.

In 1937, pilot Amelia Earhart set out to fly around the world. She never returned. Can this timeless mystery be solved? Use the unique code inside the book to access the online reader, complete with videos and interactive exercises. Word count: 1427.

People hunt for food, but they also hunt for other reasons. This reader explores the different types and purposes of hunting, uncovering the wide variety of attitudes and perspectives surrounding this age-old practice. Use the unique code inside the book to access the online reader, complete with videos and interactive exercises. Word count: 1698.

Our world changes all the time, but not everything moves quickly. Sometimes it is better to go slow! This reader explores the ways nature and technology can adapt to a slow way of life. Use the unique code inside the book to access the online reader, complete with videos and interactive exercises. Word count: 1627.

Famous works of art, rare diamonds, gold from a fictional giant in the sky - come and explore the history of stealing and how our attitudes about it have changed. Use the unique code inside the book to access the online reader, complete with videos and interactive exercises. Word count: 1384.

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 inside the book to access the online reader, complete with videos and interactive exercises. Word count: 1626.

Can teenagers dominate sports, movies, and even the business world? This reader shares the stories of some exceptional young people - regular kids who do incredible things. Use the unique code inside the book to access the online reader, complete with videos and interactive exercises. Word count: 1701.

How do you want to spend your vacation? Relaxing on a beach, whitewater rafting, at the carnival in Rio? Dream about your perfect vacation as you read! Use your unique code inside the book to access the online reader, complete with videos and interactive exercises. Word count: 1511.