Either natural gas, liquid propane, or diesel gas are utilized to run home standby generatorâs internal combustion engine to help avoid any disruption of electrical power. 1. Generac 6461 Guardian Series - The 6461 Guardian Series of automatic standby generators offer safe, clean air-cooled, and efficient operation.
The most famous implementation of hypertext is the World Wide Web.   Another Answer  A special type of database system, invented by Ted Nelson in the 1960s, in which objects (text, pictures, music, programs, and so on) can be creatively linked to each other.
100 years of crosswords: the first appeared in New York on 21.12.1913. Arthur Wynne left Liverpool for the US, left farming for journalism and then left millions delighting in solving his invention. The first crossword puzzle ran in The New York World on 21 December, 1913, 100 years ago this week, invented by Arthur Wynne. Photograph: Karen Bleier/AFP.