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These concerns are shared by other philosophers, scientists and public intellectuals who have written about similar issues (e.g. Francis Fukuyama, Jürgen Habermas, William Joy, and Michael Sandel). Estimates for the date of this Singularity vary, but prominent futurist Ray Kurzweil estimates the Singularity will occur in 2045. Meanwhile, humans were learning to harness other forms of energy. The earliest known use of wind power is the sailing ship; the earliest record of a ship under sail is that of a Nile boat dating to the 8th-millennium BCE. From prehistoric times, Egyptians probably used the power of the annual flooding of the Nile to irrigate their lands, gradually learning to regulate much of it through purposely built irrigation channels and "catch" basins. The ancient Sumerians in Mesopotamia used a complex system of canals and levees to divert water from the Tigris and Euphrates rivers for irrigation. Top 10 Emerging Technologies For 2021 Announcement of investme...

Paul Hindemith and Ernst Toch composed several pieces in 1930 by layering recordings of instruments and vocals at adjusted speeds. Influenced by these techniques, John Cage composed Imaginary Landscape No. 1 in 1939 by adjusting the speeds of recorded tones. Avant-garde composers criticized the predominant use of electronic instruments for conventional purposes. The instruments offered expansions in pitch resources that were exploited by advocates of microtonal music such as Charles Ives, Dimitrios Levidis, Olivier Messiaen and Edgard Varèse. Further, Percy Grainger used the theremin to abandon fixed tonation entirely, while Russian composers such as Gavriil Popov treated it as a source of noise in otherwise-acoustic noise music. Electronic Music Drum machines, also known as rhythm machines, also began being used around the late-1950s, with a later example being Osamu Kitajima's progressive rock album Benzaiten , which used a rhythm machine along with electronic drums and a sy...