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By J.D. Bernal

J. D. Bernal's huge paintings technology in heritage is the 1st full-scale try and learn the connection among technological know-how and society all through historical past, from the perfection of the 1st flint hand ax to the development of the hydrogen bomb. This impressive learn illustrates the impetus given to and the constraints positioned upon discovery and invention through pastoral, agricultural, feudal, capitalist, and socialist platforms, and conversely the ways that technological know-how has altered fiscal, social, and political views and practices.Volume three is dedicated solely to the 20 th century and the amazing development of medical notion which has happened nowa days -- from the hot sciences of nuclear physics and electronics to discoveries and advances in biology and comparable fields.

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Extra info for Science in History, Volume 3: The Natural Sciences in Our Time

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By the fourth and last flight of that day, Wilbur had increased the flight time and distance to 59 seconds and 852 feet. Airplanes change the world. In the years that followed, the technology of flight developed rapidly. The airplane revolutionized both peacetime and wartime. The em- The Dawn of a New Century 23 brace of the airplane as a military vehicle and weapon started in World War I, and it has continued to be a major player in wars and terrorism by making international warfare an obvious reality.

The volatile compounds are responsible for crude oil’s strong, distinctive odor. The complex molecular structure of crude oil consists mainly of hydrocarbons: compounds of carbon and hydrogen derived from organic (once-living) material. Carbon is a unique element in that it can bond with itself, making long chains. Crude oil is a mixture of hydrocarbons that have anywhere from five to more than twenty-five carbons linked together. The smaller the number of carbons, the lower the boiling point and the more likely the hydrocarbon is to be a gas such as methane.

Petroleum products were also in demand as heating oil, and as fuel to power ships and railways. What is petroleum? ) Although its origin is not completely understood, most geologists believe that the basic form of petroleum, crude oil, comes from decayed marine life buried in sediments millions of years ago. Bacterial action helped the 14 Science and Society in the Twentieth Century decay process. Heat and pressure increased as the sediments were buried deeper and deeper and this process repeated itself, forming sedimentary rock.

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