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www.reference.com/article/invented-computer-ca7b4feccc808913

Technology historians do not credit any single person with the invention of the computer. A number of individuals made discoveries that led to the development of the electronic computer.

www.reference.com/history/invented-second-d9ca4c10fd752f98

The international unit of the second was first described by the Greco-Egyptian mathematician Claudius Ptolemy in his work "Almagest" around 150 C.E. He defined the second, or second-minute, as one-sixtieth of a minute.

www.reference.com/article/invented-phone-1f0a35aec9fd2374

The telephone was invented by Alexander Graham Bell. He was granted the patent for the telephone on March 7, 1876, but he faced years of legal battles on his claim that he was the sole inventor.

www.reference.com/article/invented-personal-computer-7413edd0c809f7ee

Several people had a hand in the invention of the personal computer. In 1971, Intel engineer Ted Hoff developed the microprocessor, which enabled huge computers to be scaled down. In 1974, Micro Instrumentation and Telemetry Systems produced a personal computer kit named the Altair.

www.reference.com/article/invented-wheel-fcb26baa73ecea60

Archaeologists and historians attribute the invention of the wheel to the ancient Sumerians of Mesopotamia around 3,500 B.C. It's most probable that the wheel came about as a series of slow incremental advances to existing technologies, rather than one giant leap.

www.reference.com/article/invented-gold-f34207fcc734d773

Gold is a naturally occurring mineral, which means it wasn't invented. It was discovered. There is evidence of the utilization of gold dating back to the Copper Age (approximately 4000 BC).

www.reference.com/article/invented-post-notes-a1d0bf47751d16bf

The invention of Post-it Notes was an accidental collaborative effort between Dr. Spencer Silver and Art Fry, both 3M scientists. Fry provided the first commercially viable application for the adhesive that Silver created during one of his experiments.

www.reference.com/article/invented-world-map-5511511b0520b6f9

Claudius Ptolemaeus, who lived around 100 to 178 A.D. and is more popularly known as Ptolemy, is believed to have invented the first world map. However, cave paintings and ancient maps that pre-date Ptolemy are considered attempts to create maps to help people define and navigate the world.

www.reference.com/history/invented-steel-39c61d27d94af380

Although steel was first discovered around the 3rd century BC in ancient India, Sir Henry Bessemer created a way to standardize the process in 1856. Steel made prior to this time was called crucible steel, it was costly to make but of high quality.

www.reference.com/article/invented-hand-saw-74ee3236e9a5afc2

The inventor of the hand saw is unknown because hand saws have existed in various forms for thousands of years. Egyptian hieroglyphics have been found depicting ancient woodworkers sawing wood. As of 2014, 24 saws from 18th century England have been preserved.