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Medicine In The 20th CenturyThe 20th century produced such a plethora of discoveries and advances that in some ways the face of medicine changed out of all recognition. In 1901 in the United Kingdom, for instance, the life expectancy at birth, a primary indicator of the effect of health care on mortality (but also reflecting the state of health education, housing, and nutrition), was 48 years for males and 51.6 years for females. After steady increases, by the 1980s the life expectancy had reached 71.4 years for males and 77.2 years for females. Other industrialized countries showed similar dramatic increases. By the 21st century the outlook had been so altered that, with the exception of oft-fatal diseases such as certain types of cancer, attention was focused on morbidity rather than mortality, and the emphasis changed from keeping people alive to keeping them fit.The rapid progress of medicine in this era was reinforced by enormous improvements in communication between scientists throughout the world. Through publications, conferences, and—later—computers and electronic media, they freely exchanged ideas and reported on their endeavours. No longer was it common for an individual to work in isolation. Although specialization increased, teamwork became the norm. It consequently has become more difficult to ascribe medical accomplishments to particular individuals.
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In the first half of the 20th century, emphasis continued to be placed on combating infection, and notable landmarks were also attained in endocrinology, nutrition, and other areas. In the years following World War II, insights derived from cell biology altered basic concepts of the disease process. New discoveries in biochemistry and physiology opened the way for more precise diagnostic tests and more effective therapies, and spectacular advances in biomedical engineering enabled the physician and surgeon to probe into the structures and functions of the body by noninvasive imaging techniques such as ultrasound (sonar), computerized axial tomography (CAT), and nuclear magnetic resonance (NMR). With each new scientific development, medical practices of just a few years earlier became obsolete.