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Europe is a marvelous continent, made up of about fifty countries. But did you know that the smallest country in the world—Vatican City—is in Europe? Or that Europe is the only continent with Read More →

North America is an incredible continent, stretching from the polar ice cap almost to the equator. But did you know that the world's hottest place is in North America? Or that there are more… Read More →

South America is a remarkable continent, with its lush Amazon rain forest and its vibrant cities. But did you know that South America has the world's highest waterfall? Or that a South… Read More →

It is easy to spend money when you have a credit card or a loan. But it is also easy to spend or borrow more than you can afford. How can you use credit responsibly? How can you avoid going… Read More →

Frogs, minnows, snails, ducks, catfish, and muskrats are a few of the animals that make up a lake and pond food web. But do you know why mosquitoes, mold, water lilies, and bacteria are… Read More →

Did you know that most of the energy we use comes from coal, oil, and natural gas? How do workers collect these fossil fuels? And what effects do these fuels have on the environment? Read… Read More →

Did you know people can dig underground and use Earth's heat to make energy? This geothermal energy can power the computer and heat or cool your home. How exactly do we get it, though? And… Read More →

Did you know people can turn the energy in rushing water into electricity? This hydropower can run the computer and the lights in your home. How exactly do we get it, though? And what is the… Read More →

Did you know that tiny atoms that make up all matter hold huge amounts of energy? This energy, called nuclear energy, can power the television and refrigerator in your home. How is nuclear… Read More →

Did you know that the sunlight that warms your skin on a sunny day can be used to produce energy? But how exactly do you collect sunlight and turn it into energy we can use? And what is the… Read More →

Did you know that the same wind that messes up your hair can be used to create energy? How exactly do you harness the wind? And what is the effect on the environment? Read this book to find… Read More →

Have you ever worn silk? Eaten Rice? Used a calendar? All these things came from ancient China. More than two thousand years ago, the ancient Chinese invented tools and treasures that still… Read More →

Have you ever heard of hieroglyphics? Do you know what a mummy is? All these things came from ancient Egypt. More than four thousand years ago, the ancient Egyptians created tools and… Read More →

Have you ever watched the Olympic Games? Voted in a class election? Used an alphabet with twenty-six letters? All these things came from ancient Greece. More than two thousand years ago, the… Read More →

How often do you write or read? Do you live in or near a city? Writing and cities both began in ancient Mesopotamia. Six thousand years ago, the ancient Mesopotamians created tools and… Read More →

Have you ever wanted to play the flute? Or have you seen a building with a domed ceiling? These things have roots in ancient Rome. More than two thousand years ago, the Roman Empire was the… Read More →

Do you use a calendar? Have you ever played basketball? These things were important to the ancient Mayans too. About four thousand years ago, they invented tools and treasures that still… Read More →

Snakes, lizards, rabbits, mice, mountain lions, and hawks are some of the many animals that make up a desert food web. But do you know how desert animals depend on cactuses, grasses, and… Read More →

Beetles, toads, squirrels, owls, deer, and black bears are some of the many animals that make up a forest food web. But did you know that leaves, berries, mushrooms, and tiny bacteria are… Read More →

Prairie dogs, vultures, grasshoppers, goldfinches, pocket gophers, and bison are some of the many animals that make up a grassland food web. But do you know how the many types of grasses in a Read More →

Minerals are fascinating resources that have a variety of uses. A diamond is a mineral that is sought after for its beauty. Salt is a useful mineral that adds flavor. But do you know what… Read More →

Seals, otters, oysters, fish, pelicans, and sharks are a few of the animals that make up an ocean food web. But did you know that almost all ocean creatures depend on algae to live? Or that… Read More →

Moose, lemmings, owls, wolves, bumblebees, and grizzly bears are some of the many animals that make up a tundra food web. But did you know that worms, beetles, mushrooms, and bacteria break… Read More →