But what if, nonetheless, Einstein got it wrong?Since the 1930s, physicists have noticed an alarming discrepancy between the universe as we see it and the universe that Einstein's theory of relativity predicts. There just doesn't seem to be enough stuff out there for everything to hang together. Galaxies spin so fast that, based on the amount of visible matter in them, they ought to be flung to pieces, the same way a spinning yo-yo can break its string. Cosmologists tried to solve the problem by positing dark matter—a mysterious, invisible substance that surrounds galaxies, holding the visible matter in place—and particle physicists, attempting to identify the nature of the stuff, have undertaken a slew of experiments to detect it. So far, none have.Now, John W. Moffat, a physicist at the Perimeter Institute for Theoretical Physics in Waterloo, Canada, offers a different solution to the problem. The cap­stone to a storybook career—one that began with a correspondence with Einstein and a conversation with Niels Bohr—Moffat's modified gravity theory, or MOG, can model the movements of the universe without recourse to dark matter, and his work chal­lenging the constancy of the speed of light raises a stark challenge to the usual models of the first half-million years of the universe's existence.This bold new work, presenting the entirety of Moffat's hypothesis to a general readership for the first time, promises to overturn everything we thought we knew about the origins and evolution of the universe.

     What is the biggest land animal? What animal runs the fastest? Can elephants really eat more than 300 pounds of grass each day? Dive into this fascinating book that introduces fourteen members of the animal kingdom who hold “world records” for their astonishing traits. Young readers will find easy to understand comparisons, helpful charts, and a guide to where these amazing animals can be found in the wild. Made with his award-winning cut-page collage illustrations, Steve Jenkins brings the fascinating facts about our natural world alive in this educational and entertaining book.

    this is one of those rare books that will change your beliefs - and in doing so will change your life. tHE ANt AND tHE FERRARI offers readers a clear, navigable path through the big questions that confront us all today. What is the meaning of life? Can we be ethical beings in today's world? Can we know if there is life after death? Is there such a thing as Absolute truth? What caused the Big Bang and why should you care?

    Then, suddenly, they died out. For thousands of years, no one knew these giant creatures had ever existed. Then people began finding fossils—bones and teeth and footprints that had turned to stone. Today, teams of experts work together to dig dinosaur fossils out of the ground, bone by fragile bone. Then they put the skeletons together again inside museums, to look just like the dinosaurs of millions of years ago.

    With straightforward text, humorous asides, and kid-friendly full-bleed photographs throughout, young readers will love learning all about these nocturnal creatures. Award-winning author/illustrator Tedd Arnold really brings nonfiction to life for beginning readers! And this book has eye-catching holographic foil on the front cover!

    This informative concept book includes detailed pictures of leaves in different sizes, shapes, and colors and a list of activities that kids can do with leaves.This is a Stage 2 Let's-Read-and-Find-Out, which means the book explores more challenging concepts for children in the primary grades. Let's-Read-And-Find-Out is the winner of the American Association for the Advancement of Science/Subaru Science Books & Films Prize for Outstanding Science Series.Supports the Common Core Learning Standards and Next Generation Science Standards

    Children's Choice Award winner Bethany Barton applies her signature humor to the scariest subject of all: math!Do multiplication tables give you hives? Do you break out in a sweat when you see more than a few numbers hanging out together? Then I'm Trying to Love Math is for you! In her signature hilarious style, Bethany Barton introduces readers to the things (and people) that use math in amazing ways -- like music, and spacecraft, and even baking cookies! This isn't a how-to math book, it's a way to think differently about math as a necessary and cool part of our lives!

    He struggled in school and often got in trouble with his twin brother, Mark.Then one day Scott discovered a book about test pilots and astronauts that set him on a new path.His new focus led him to fly higher and higher, becoming first a pilot and then an astronaut, along with his brother--the first twin astronauts in history. But his greatest accomplishment of all was commanding the International Space Station and spending nearly a year in space, which set the record for the longest spaceflight by an American.This story of an ordinary boy who grew up to do extraordinary things is perfect for children, fans of Scott's adult book Endurance: A Year in Space, A Lifetime of Discovery, aspiring astronauts, and anyone who has ever tried to defy the odds. It will amaze and inspire you.

    "No Taxation without Representation!" The Boston Tea Party stands as an iconic event of the American Revolution—outraged by the tax on tea, American colonists chose to destroy the tea by dumping it into the water! Learn all about the famed colonialists who fought against the British Monarchy, and read about this act of rebellion from our history! With black-and-white illustrations throughout and sixteen pages of photos, the Boston Tea party is brought to life!

    For thousands of years, humans believed that Earth was at the center of the Universe, but all of that changed in the 17th century. Astronomers like Nicolaus Copernicus, Galileo Galilei, Johannes Kepler, and Isaac Newton proposed the unthinkable theory that Earth and the other planets actually revolved around the Sun. This engaging book chronicles the beginning of the modern age of astronomy, then follows later discoveries, including NASA's current missions in space.

    Tiny likes to read. But both twins like to eat . . . POPCORN! So while Tony cooks it, Tiny reads about what popcorn is, how it's stored, how it's cooked, how different Native American people made it, how much popcorn Americans eat, popcorn stories and legends, and popcorn recipes. Tomie de Paola, who eats a lot of popcorn, shares what he knows about it with humor and imagination.

    Discover the epic story of World War II through a fun timeline, witness deadly technology and combat weapons and meet the leaders who directed the global conflict. Simple history gives you the facts, simple!

    Ages 3-6 "Let's Talk About Feeling Angry" (Let's Talk About series) helps children understand and manage the difficult emotion of anger. Joy Berry's down-to-earth approach shows children real ways to handle their anger in different situations. Like all of Joy Berry's books, "Let's Talk About Feeling Angry" speaks directly to the child and acts as a problem-solving resource for parents and caregivers. The book is filled with full-color illustrations and simple text that make the sometimes-difficult information easy to take in.

    Here is a picture book designed especially for young children who are becoming sexually aware but aren't ready to learn about sexual intercourse. Written with warmth and honesty, Amazing You! presents clear and age-appropriate information about reproduction, birth, and the difference between girls' and boys' bodies. Lynne Cravath's whimsical illustrations enliven the text, making this a book that parents will gladly share with their young ones.

    But only the sun wakes us in the morning, helps us to grow, plays hide-and-seek behind the clouds, and paints pretty pictures in the evening sky. Frank Asch's gentle text and vivid illustrations celebrate the unique and wondrous qualities of our favorite and most powerful star. This is the third in a group of books for young children that explore the natural world.