The wedge, one of the six classical simple machines, has been used from the very beginning of humankind's tool-making era, approximately 2.6 million years ago. As such, no single attributed inventor has been identified.
An early form of the wedge was the hand-axe, found to be crafted in the early Paleolithic age by chipping away at a rock to form a sharp edge. The mechanical advantage of a wedge is equal to the ratio of the length of its slope to the width; a longer and skinnier wedge requires less force, so it's more effective for splitting an object than a shorter and wider wedge.Learn More
Although sundials have been used since the 8th century B.C., the first individual to be credited with the invention of a sundial is Aristarchus of Samos in about 280 B.C.Full Answer >
According to About.com, spoons have been used for purposes of eating and serving since Paleolithic times. While it is unknown who specifically invented the spoon, archaeological finds date spoons back to 1,000 B.C.Full Answer >
Aprons have been used since ancient times, first by craftsmen working with potentially dangerous materials such as metal and glass, then later by cooks and household workers. The garments worked well for tasks associated with cooking, such as carrying firewood or eggs.Full Answer >
Paper money was used first by the Chinese during the Tang Dynasty (A.D. 618 to 907). According to Time, the first forms of paper money were privately issued bills of credit or exchange. This practice continued for about 500 years.Full Answer >