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2. Circular saw - Wikipedia

   en.wikipedia.org/wiki/Circular_saw

   Circular saws may also be loosely used for the blade itself. Circular saws were invented in the late 18th century and were in common use in sawmills in the United States by the middle of the 19th century. A circular saw is a tool for cutting many materials such as wood, masonry, plastic, or metal and may be hand-held or mounted to a machine.

3. Tool - Wikipedia

   en.wikipedia.org/wiki/Tool

   Other tools have a primary purpose but also incorporate other functionality – for example, lineman's pliers incorporate a gripper and cutter and are often used as a hammer; [39] and some hand saws incorporate a square in the right-angle between the blade's dull edge and the saw's handle.

4. Chainsaw - Wikipedia

   en.wikipedia.org/wiki/Chainsaw

   Historical osteotome, a medical bone chainsaw. A "flexible saw", consisting of a fine serrated link chain held between two wooden handles, was pioneered in the late 18th century (c. 1783 –1785) by two Scottish doctors, John Aitken and James Jeffray, for symphysiotomy and excision of diseased bone, respectively. [2]

5. Timeline of historic inventions - Wikipedia

   en.wikipedia.org/wiki/Timeline_of_historic...

   Ancient stone tools from Ethiopia were hand-crafted by Australopithecus or related people. [1] [2] [further explanation needed] 2.3 Mya: Earliest likely control of fire and cooking, by Homo habilis [3] [4] [5] 1.76 Mya: Advanced stone tools in Kenya by Homo erectus [6] [7] 1.75 Mya – 150 kya: Varying estimates for the origin of language [8] [9]

6. History of the World Wide Web - Wikipedia

   en.wikipedia.org/wiki/History_of_the_World_Wide_Web

   By December 1990, Berners-Lee and his work team had built all the tools necessary for a working Web: the HyperText Transfer Protocol (HTTP), the HyperText Markup Language (HTML), the first web browser (named WorldWideWeb, which was also a web editor), the first web server (later known as CERN httpd) and the first web site (https://info.cern.ch ...