Great Inventions Through the Ages

Throughout history, clever inventions have changed the way humans live. Some happened thousands of years ago, while others are so recent that your grandparents remember a world without them. An invention is a brand-new idea or device; a discovery is finding out something that was already there, like a new planet.

Interestingly, the wheel was first used not for carts but for shaping pottery, spinning round as a potter's wheel. Only later did someone have the brilliant idea of turning it on its side, adding an axle, and using it to move heavy loads. Great inventions often start by being used for something unexpected.

Writing was another world-changing invention. It first appeared in Mesopotamia around 3200 BCE as wedge-shaped marks called cuneiform, pressed into wet clay. Writing let people record information — laws, stories, and trades — and pass it on to future generations instead of relying only on memory.