The development of the electron microscope in the late 1930s allowed scientists to view the smallest of objects and organisms. The images in this article were probably the earliest clear images of viruses. Utilizing an electron microscope allowed Luria to verify the size of various phages, which he had earlier estimated by indirect methods. For this work, Luria earned a Guggenheim fellowship, enabling him to spend most of 1942 working with Max Delbruck at Vanderbilt University.
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