Inventions I nventions are new ideas that solve problems or prove useful to us. Thousands of years of brilliant brainpower have resulted in things and ideas that have transformed people’s lives. Even in the modern world, people keep coming up with new ideas and inventions. *Thomas Edison (1847–1931) was an American master of invention, patenting 1,093 ideas in his lifetime, including batteries and light bulbs. The Great Thomas Edison … Hand axe - The hand axe was the first stone tool in prehistoric times. People dug for flint, which they shaped into handcrafted axes to cut meat, chop wood, scrape skins, and protect themselves. Hand axes were used for more than a million years. Wheel - The wheel was invented more than 5,000 years ago in Mesopotamia (part of modern-day Iraq). Wooden discs were attached to animal carts to carry heavy loads. Later, wheels became...
A mphibians - Amphibians are animals that spend their lives in and around water. They hatch in water from eggs. As they grow they develop lungs that let them breathe on land. Amphibian skin must always be wet, so they stay close to water. There are three main groups of amphibian. Newts and salamanders - these long-tailed amphibians can replace injured body parts by growing new ones. An eye, leg, or tail takes just weeks to replace. Caecilians- Though they look like worms, caecilians (se-sill-yens) are amphibians. They live underwater or in underground burrows on land. Frogs and toads - The most common group of amphibians includes frogs and toads. Frogs are usually wetter, smaller, and smoother than toads. Fact Forever...
Birds Birds are animals that have feathers and beaks. They lay hard eggs, which their chicks hatch out of. Most birds can fly, and they are found all over the world. Swimming birds- Not all birds can fly. Penguins swim underwater instead. Their feathers are waterproof, and they use their wings to steer. Emperor penguin Wading birds - These long-legged birds wade around in the mud. They search for small animals, such as crabs, in the water to eat. Scarlet Ibis- Birds of prey - Birds of prey hunt for their food. They have sharp beaks, fly fast, and grab food, such as fish, with their feet. Bald eagle Songbirds- Most birds in the world are part of a huge family called songbirds. Each type of songbird has its own special song. Yellow warbler Eggs Some young animals grow and develop inside round objects called eggs. There are different types of eggs. The size of the egg and the length of time it takes to hatch depend on the size of ...
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