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Death of Hypatia, 415 AD
Royalty Free 
Close-up photo of an electrode & catheter
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Monitoring system for cardiac catheterization lab
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Coronary angiography suite
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Coronary angiography suite
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Woman undergoing barium meal x-ray examination
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X-ray image of cardiac catheterization
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Heart catheterization with micromenometer
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Heart catheterization with micromenometer
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Heart catheterization with micromenometer
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Sir William Osler (1849-1919), Canadian physician
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Patient undergoing carotid angiography examination
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Patient undergoing an angiography examination
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Computer keyboard
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Computer keyboard
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Los Alamos ID photos of Robert & Kath Oppenheimer
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J. Robert Oppenheimer
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J. Robert Oppenheimer
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Woman undergoing a barium enema X-ray examination
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The German astronomer, Heinrich Olbers
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Prof. Yoshi-Hiko Ohtsuki in English crop circle
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Dame Kathleen Ollerenshaw and a magic square
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Lateral oblique mammography examination
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Cut surface of Jurassic limestone from Dorset, UK
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Cut surface of tufa from Italian travertine
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