Tracy Sue Walker

The United States is a global superpower. With fifty states and sixteen territories, the US is the world's fourth largest country. More than 331 million people call the US home. Learn more about the US from its first peoples to its presidents. Discover the nation's three branches of government. Then uncover the US's challenges from climate change to becoming a fairer country. The US's decisions on these topics will impact the rest of the world.

Russia is a world power. Stretching from eastern Europe to northern Asia, Russia is the world's largest country. Over 140 million people live in Russia. Follow the country's history from being part of the Soviet Union to becoming its own nation. Then learn about Russia's economy, government, and current events, and discover how Russia's future will impact the rest of the world.

The United Kingdom is a world power. Made up of England, Scotland, Wales, and Northern Ireland, the UK covers about 94,000 square miles. Learn about key leaders from the monarchs that ruled to modern prime ministers. Then discover the UK's branches of government and important parts of the country's economy. Discover challenges the UK faces and look to the nation's future.

Jesse Owens spent his childhood running along the dirt roads of Alabama with his father. It wasn't long until he was breaking records in high school and dreaming of competing in the Olympics. The world watched as he rocketed to win four gold medals in the 1936 Olympics. Learn more about the life of Jesse Owens and how he became a true legend.

Dale Earnhardt Jr. was born to drive. Following in the footsteps of his father, NASCAR champion Dale Earnhardt, Dale Jr. rose quickly through the racing ranks. From thrilling wins in the Daytona 500 to crushing losses, learn more about the fascinating career of one the most popular drivers in auto racing history.

Dale Earnhardt Jr. was born to drive. Following in the footsteps of his father, NASCAR champion Dale Earnhardt, Dale Jr. rose quickly through the racing ranks. From thrilling wins in the Daytona 500 to crushing losses, learn more about the fascinating career of one the most popular drivers in auto racing history.

Climate change is the cause of many major issues affecting people around the globe today, from floods to hurricanes to heat waves. But what causes climate change? Discover the science behind the greenhouse effect, where greenhouse gases come from, and what you can do to stop the causes of climate change.

Earth's climate is changing, but many people are working hard and coming up with solutions to fight the climate crisis. From the first Earth Day to Fridays for Future, learn about the rise of climate change activism. Then discover some of the people who are leading activists, such as Xiuhtezcatl Martinez, Vandana Shiva, and Rhiana Gunn-Wright.

Earth's climate is changing, but many people are working hard and coming up with solutions to fight the climate crisis. From the first Earth Day to Fridays for Future, learn about the rise of climate change activism. Then discover some of the people who are leading activists, such as Xiuhtezcatl Martinez, Vandana Shiva, and Rhiana Gunn-Wright.

Climate change affects everyone around the globe, but what causes it? Readers explore the science behind the greenhouse effect, where greenhouse gases come from, and what they can do to lower their own carbon footprints.