In mathematics, the order of operations, believed to have been in its formative stages in the 16th century, is not credited to a single inventor. This mathematical convention developed as a conceptual process in solving ... More »

The first records of elevator use trace back to the third century B.C., and the original inventor is unknown. The earliest elevators were primitive and used human, animal or water-wheel power. More »

The invention of the telephone is credited to 19th century Scottish-born inventor Alexander Graham Bell. At the time, his contemporary Elisha Gray independently developed a telephone. Bell was able to beat Gray to acquir... More » History Inventions

Although the inventor of the nail clipper is unknown, the device first surfaced in the late 19th century. The first versions looked like overweight tweezers and were operated by squeezing, and the design hasn't changed m... More »

The order of operations in mathematics is the order in which one performs certain operations when solving an equation. The simple way to remember this is by following "PEMDAS," which stands for "Parentheses, Exponents, M... More » Math Algebra

Martin Ohm is considered to be the golden ratio inventor, according to MathWorld, as he first used the term "golden section" in 1835. The golden ratio is a value such that x / 1 = 1 / (1 - x). More » History Inventions

Heinrich Goebel, a German inventor and mechanic, patented three inventions, including a sewing machine hemmer improvement, a Geissler system of vacuum pumps improvement and an electric incandescent lamp. The lamp patent ... More » History Inventions