National Geographic : 1999 Dec
"Because of the... tools of machine M medical imaging has evolved dramatically since 1895, when physicist Wilhelm Konrad Rontgen made his wife's hand (above) the subject of the first x-ray photograph. Chronicling this exploration of inner space, the magazine has helped readers understand diagnostic tools like MRI, magnetic resonance imag ing (right, January 1987), which draws a blank on bones but provides detailed images of soft tissue. Scientists first identified HIV, the virus that causes AIDS, in 1983. In June 1986 Lennart Nilsson's scanning electron micrograph showed the deadly virus (above right, in blue) emerging from a major component of the human immune system-a helper T cell magnified 30,000 times. NationalGeographicPhotographs: The Milestones, new from the Society's Book Division, illustrates the Geographic's impact on photography. To see "Stories of the Century," go to www.nationalgeographic.com/century.