What's faster than a cheetah?—no animal on earth can run faster. But a peregrine falcon can swoop faster than a cheetah can run. And the falcon can't compare to an airplane, a rocket, or the speed of light. Lively text and watercolors will make children laugh while they learn all about speed.

"Uses children's literature as a springboard into activities that engage children in mathematical problem solving and reasoning"--from back cover.

It's hard to imagine—the molecules in the glass of water you just finished might have once been part of a water hole that dinosaurs drank from! In this fascinating new book about the water cycle, readers will find that while it might be hard to imagine, it's true. The author, Robert E. Wells, explains the complete water cycle and also discusses ocean currents, ocean and lake habitats, and hydroelectricity. He also touches on water pollution and our responsibility to keep our water clean. The author's bright cartoon illustrations make this information especially appealing to kids.

Using fun facts and creative comparisons, science author Robert E. Wells answers some of humankind's biggest questions about the world we live in. This collection of twelve STEM picture books by award-winning author Robert E. Wells will spark kids' curiosity in our universe, from the time of dinosaurs to the present day. This collection includes e-book editions of Can We Share the World with Tigers?; Can You Count to a Googol?; Did a Dinosaur Drink This Water?; How Do You Know What Time It Is?; How Do You Lift a Lion?; Is a Blue Whale the Biggest Thing There Is?; Polar Bear, Why Is Your World Melting?; What's Faster Than a Speeding Cheetah?; What's Older Than a Giant Tortoise?; What's Smaller Than a Pygmy Shrew?; What's So Special about Planet Earth?; and Why Do Elephants Need the Sun?

In the Arctic, the summer ice is melting, making it hard for polar bears and their cubs to survive. Why is the world getting warmer? The heat of the sun is trapped by the "greenhouse" gases that surround Earth—carbon dioxide, methane, nitrous oxide, and water vapor. If there is just the right amount of these trapped gases, the air is warm enough for plants, animals, and people to thrive. But now there is too much greenhouse gas, especially carbon dioxide. Polar bears, and all of us, are in trouble. Robert E. Wells shows why so much carbon dioxide is going into the air and what we can do to help keep Earth cool.

There are trillions of stars in the universe, but we rely on our sun to provide (or contribute to) most of what we need to survive and thrive: heat, light, plants, animals, wind, and water. Complete with fun, cartoon illustrations, this book give kids plenty of information about our sun in an easy-to-read and digest format. By focusing on the needs of an elephant, Wells makes clear just how important the sun is to life on Earth.

Bengal tigers are an endangered species due to many human-caused factors, such as poaching, habitat destruction, and global warming. In Robert Wells's signature style, this book explores these difficult topics in a child-friendly manner with endearing illustrations--and it gives kids ways they can help to save the tigers, too.