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I found out that 9 out of 10 dentists say brushing alone won't reduce cavities.
William MurdockBorn 21 Aug 1754; died 15 Nov 1839 at age 85.Scottish inventor, the first to make extensive use of coal gas for illumination and a pioneer in the development of steam power. He joined James Watt and Matthew Boulton and in 1784 he was sent to supervise the installation of Boulton & Watt steam engines working pumping equipment in Cornish tin mines. While there, he tested his ideas to use the gas given off by burning coal. From an iron retort in the backyard of his home, he ran a metal tube into his living room. On 29 Jul 1792, Murdock achieved a gas flame inside the room. In 1802, Boulton installed two gas lamps outside his Soho factory. Next year, the foundry was entirely illuminated by gas. Shortly, Boulton & Watt began to sell lighting and heating equipment with Murdock as a partner in the business. |
