World's greatest invention

4. I am a machine that can transport people and goods over long distances, with four wheels to keep me grounded and an engine to power me forward. I also have another name which starts with c, and with 3 letters. What am I?
5. I am a machine that runs on tracks, with wheels that never touch the ground. I transport people and goods across vast distances, and I have been an important part of transportation history for over 200 years. What am I?
6. I fly through the air, taking people to distant lands, and I need a long strip of pavement to take off and land. What am I?
8. I’m made of glass, and can illuminate a room with a flip of a switch? What am I?
9. I'm a household appliance that keeps your food fresh. I’m often made of steel, and my motor hums all through the day. What am I?
10. I am a device used for birdwatching, stargazing, and other outdoor activities. I can help you see things that are too small, too far away, or too faint to be seen with the naked eye. What am I?

1. It may be a product, a process, or a method that solves a problem or fulfills a need. It can change the way people live, work, and interact with the world.
2. I’m an electronic device that is designed to perform a wide range of tasks, including storing, word processing, and communicating information. What am I?
3. I am a machine that blows cool air, making hot days more bearable. I can be found in homes and cars, and I have the power to control the temperature. What am I?
5. I am a device that lets you hear someone's voice from far away, but you can't see them. I work by converting sound waves into electrical signals that travel through wires or radio waves. What am I?
7. I'm a vessel that travels deep, beneath the ocean's blue. My crew and I explore the depths, in search of something new. What am I?
11. I am a tool used for navigation, with a magnetic needle that always points north. Sailors, hikers, and explorers have relied on me for centuries to find their way. What am I?