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The Moon is Earth's only natural satellite. As the Moon orbits Earth, it appears to change shape as the part of it struck by the Sun's light changes. Learn more in Earth and the Moon, a title in the Space Systems: Stars and the Solar System series.

The Supreme Court justices are the top judges in the country. The decisions they make shape the laws of the United States.

The governor is the top politician in his or her state. Each of the 50 U.S. states elects its own governor.

Snowmobile riders follows tracks with steep hills and obstacles. Snowmobiles can go faster than 100 miles (160 kilometers) per hour. Learn more about one of the world's most daring sports and the athletes who take part in it in Snowmobiling, part of the Extreme Adrenaline series.

Snowmobile riders follows tracks with steep hills and obstacles. Snowmobiles can go faster than 100 miles (160 kilometers) per hour. Learn more about one of the world's most daring sports and the athletes who take part in it in Snowmobiling, part of the Extreme Adrenaline series.

Snowboarders practice in the snowboard parks at ski resorts. They know they will need a variety of tricks to score well in competitions. Learn more about one of the world's most daring sports and the athletes who take part in it in Snowboarding, part of the Extreme Adrenaline series.

Snowboarders practice in the snowboard parks at ski resorts. They know they will need a variety of tricks to score well in competitions. Learn more about one of the world's most daring sports and the athletes who take part in it in Snowboarding, part of the Extreme Adrenaline series.

Some skateboarders use sidewalks and city streets to practice their freestyle moves. Others use ramps to show off tricks as they fly through the air. Learn more about one of the world's most daring sports and the athletes who take part in it in Skateboarding, part of the Extreme Adrenaline series.

Some skateboarders use sidewalks and city streets to practice their freestyle moves. Others use ramps to show off tricks as they fly through the air. Learn more about one of the world's most daring sports and the athletes who take part in it in Skateboarding, part of the Extreme Adrenaline series.

Did you know that ecologists look for patterns and trends that show how and why environmental changes are happening? Their discoveries help people modify their ways to keep the environment healthy. Discover more fascinating facts in Ecologist, a STEM Careers book.

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The human population became more than 1 billion in 1804. Today, more than 7 billion humans live on the planet. Examine how human populations change and affect the world in Population, one of the titles in the World Geography series.

Each title in the series, including The Catcher in the Rye, features comprehensive teacher resources, such as rubrics and activity-oriented teacher notes, to help guide lesson plans. Historical documents and first-hand accounts provide meaningful context to help readers study each work of literature and discover its relevance today. Your Lightbox media enhanced book features a teacher resource that includes extension activities and teacher not...

Each title in the series, including The Adventures of Huckleberry Finn, features comprehensive teacher resources, such as rubrics and activity-oriented teacher notes, to help guide lesson plans. Historical documents and first-hand accounts provide meaningful context to help readers study each work of literature and discover its relevance today. Your Lightbox media enhanced book features a teacher resource that includes extension activities and...

A budget is a plan for how to use money. The government has a budget that manages money for roads, schools, hospitals, and other community expenses. Learn how budgets work, when budgeting began, the technology used, and more in Budgeting, a title in the Economics series.

Explore some of the English language's most important literary works in Lightbox Literature Studies. Each title in the Lightbox Literature Studies series, including Nineteen Eighty-Four, features comprehensive teacher resources, such as rubrics and activity-oriented teacher notes that act as a springboard for teachers to guide their lesson plans. Historical documents and first hand accounts provide meaningful context to aid readers in further ...

In 480 bc, more than 49 million people lived in the Persian Empire. Today, the text on an ancient Persian cylinder is recognized as the first charter of human rights. Learn more in Persians, one of the titles in the Ancient Empires and Civilizations series.

China was ruled by 22 different dynasties over the course of more than 3, 500 years. Ancient China was responsible for many inventions, ranging from paper to umbrellas. Learn more in Chinese, one of the titles in the Ancient Empires and Civilizations series.

The United Kingdom is a small island country located off the northwestern coast of mainland Europe. The country's diverse landscapes include long, rugged coastlines, rolling hills, and mountain peaks. Learn more in United Kingdom, one of the titles in the Countries series

Snowmobiling was added to the Winter X Games in 1998. Snowmobilers in the Winter X Games SnoCross event can reach speeds of 60 miles (96 kilometers) per hour while airborne. Learn more in Snowmobiling, one of the titles in the Extreme Sports series.