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Examines pulleys, explains their functions, and suggests simple experiments to explore their uses.

Examines inclined planes, explains their functions, and suggests simple experiments to demonstrate how they work.

Have you ever stared into the night sky, full of stars and planets? As a kid, Neil deGrasse Tyson was star-struck when he first visited a planetarium. The universe was calling him. Tyson pursued his interest in astronomy and studied to be an astrophysicist. In 1996, he became the director of New York's Hayden Planetarium. He is passionate about teaching people about the universe. Known for making science fun and easy to understand, he has hosted and appeared on TV shows such as Nova ScienceNow and The Daily Show with Jon Stewart.

Robots help us understand our weather and climate. Some fly into storms to measure wind. Others dive into the ocean to learn about weather patterns. And some drive across frigid polar regions to gather climate data. How are robots helping us plan for the weather of the future? Listen to this audiobook to find out!

Robots help us understand our universe. Some fly to distant planets. Others work alongside astronauts in space. And some drive across the surface of Mars. How do these robots work, and what are they doing today? Listen to this audiobook to find out!

Robots help people in many situations. Some robots rescue people trapped by tornadoes or earthquakes. Others explore volcanoes and the sea floor. And some help scientists protect our environment. How might helper robots affect your life? Listen to this audiobook to find out!

Did you know that President Thomas Jefferson used a copier? Or that one of the world's fastest computers is the size of a two-story house? Get ready to learn the strange stories behind technology inventions you use every day. From the teenager who first imagined the television, to a $900 smartphone named Simon, you'll find out how we got the technological wonders that help us connect, create, and keep up.

Did you know that the world's first submarine traveled the Thames River in England way back in 1615? Or that early cars had three wheels instead of four? Get ready to learn the fascinating stories behind inventions you use every day. From the motorcycle inventor who died while riding his creation, to the engineers who figured out a better way to launch humans into space, you'll find out how we got the transportation inventions that get us where we're going.

Did you know that people with rakes used to do the work of garbage trucks? Or that porta-potties were put on ships to keep workers from running to shore for bathroom breaks? Get ready to learn the odd stories behind inventions you use every day. From the T.P. of Chinese emperors to the landfills of ancient Greece, you'll find out how we got the sanitation inventions that keep us healthy and keep the world smelling fresh.

Did you know that a scientist discovered X-rays by accident? Or that people have been taking pain medicine for more than 5,000 years? Get ready to learn the strange stories behind inventions you use every day. From the Roman warrior with a famous false hand, to the Boy Scouts who made Band-Aids a big deal, you'll find out how we got the medical wonders that help us heal faster and feel better.

Do you know what happened when a kid forgot his glass of soda with a stir stick in it outside on a freezing cold night? Popsicles were invented! And did you know ancient people loved to chew on gum, just like we do? Get ready to learn the strange stories behind inventions you use every day. From the guy who thought white-flour snacks were evil so he invented graham crackers to the evolution of ketchup, you'll be amazed how we got the food inventions we enjoy today.

Did you realize that swimming suits used to weigh 22 pounds (about 10 kilograms)? Or that the first people to wear high heels were French royalty (even the king!) in the 1500s? Get ready to learn the amazing stories behind inventions you use every day. From the society woman who invented bras to the Swiss inventor who came up with the idea for Velcro, you'll find out how we got some of our favorite fashion inventions.

Can you believe that the first tennis balls didn't bounce? Or that the world's first basketball hoop was a peach crate? Get ready to learn the amazing stories behind inventions you use every day. From the Minnesota teen who invented water skis to the Missouri mechanic who came up with the idea of driving over cars with his monster pickup truck, you'll find out how we got some of our favorite entertainment inventions.

Can you believe that the paint used on cars inspired the invention of nail polish in the 1920s? Or that people have been making hair dyes for thousands of years, using everything from boiled walnuts to gold powder? Get ready to learn the strange stories behind inventions you use every day. From the woman who invented "kissproof" lipstick to the role toothpicks played in the creation of Q-tips, you'll find out how we got the beauty inventions that help us look great.

Have you ever wondered just how a glow stick works? Or what about those glow-in-the-dark stars you stick on your ceiling keep on shining? In her first book, author and teacher Anita Sitarski answers these questions and more giving listeners the inside scoop on everything that glows. Fireflies, bacteria, squid, jelly fish—what do all of these things have in common? They glow! It seems like one of mother nature’s mysteries, but many curious scientists have begun to shine light on this beautiful phenomenon.

This fascinating look at history's most mysterious messages is packed with puzzles to decode and ciphers that kids can use themselves. Here are the encrypted notes of Spartan warriors, the brilliant code-crackers of Elizabeth I, secret messages of the American Revolution, spy books of the Civil War, the famous Enigma Machine, and the Navajo code talkers. As computers change the way we communicate, codes today are more intriguing than ever. From invisible ink to the CIA, this exciting trip through history is a hands-on, interactive experience - so get cracking!

Innovation starts with a problem whose solution sets in motion all kinds of unexpected discoveries. That's why you can draw a line from pendulums to punching the clock at a factory, from ice blocks to summer movie blockbusters, from clean water to computer chips. In the lively storytelling style that has made him a popular, best-selling author Steven Johnson looks at how accidental genius, brilliant mistakes, and unintended consequences shape the way we live in the modern world.

Discover the extraordinary stories behind everyday things! Did you know that the ice cream sundae was invented because of a law forbidding the sale of ice cream on Sundays? Or that the first motorcycle was really just a tricycle with a motor? Would you believe that Mickey Mouse started out as a rabbit? Arranged in alphabetical order, this fascinating book is packed with the stories behind these and over 100 more inventions.

Vollis Simpson was a man with a curious mind—always eager to know how things worked and how to fix them. Growing up on a farm in North Carolina, he loved to tinker with machines. And when he served in the Army Air Corps during WWII, Vollis kept right on tinkering. His ingenuity allowed him to build things no one would have thought to create from scraps—a washing machine out of airplane parts and a motorcycle out of a bike. After the war, his passion for metal creations picked up speed—turning into a whirlwind of windmills as far as the eye could see.

Bridget and Tom travel to Butterälp to stay with Vivienne Velvete – the world’s finest chocolatier. But a horrifying monster is terrorising the villagers and the chocolate festival has been shut down. What's more, Le Choc - the world's most perfect bar of chocolate, kept in an alarmed, triple-locked room – has been chomped! Bridget and Tom must trace a track of confuddling clues and unravel their most fiendish plot yet.