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Viruses are the cause of some of mankind's most deadly epidemic diseases-e.g., influenza, yellow fever, smallpox, infantile paralysis. But until a few years ago, nobody had ever seen a virus. Now, thanks to the electron microscope which makes them visible, biologists are able to study the viruses' submicroscopic world...
Viruses are the smallest known disease-producing organisms: the biggest of them is less than one-hundred-thousandth of an inch in diameter. Biologists once wondered whether a virus was a living organism or just an overgrown, active protein molecule. The dispute is still not entirely settled, but the electron microscope shows that many of them look and act like living things. At a recent American Medical Association symposium, leading U.S. virologists described an amazing variety of viruses, ranging from types that attack only bacteria to those that infect...
...social sciences plane, the exhibit features the first edition of Nietzche's "Geneologie de Moral," the first written presentation of Einstein's Corpuscular Theory of Light, and the first edition of Millikan's "The Electron...
...Princeton, 15 years later, Dr. Dirac, who had forecast a particle, theorized about what happens when one particle strikes another. He selected the two simplest: the electron and the photon (unit of electromagnetic radiation, such as light). To explain how they interact, he ploughed through relativistic bafflements, covered a blackboard with lacy mathematics. Many listeners looked as if they had been hit on the head. Dirac himself seemed unsure...
...Danish accent, Bohr spoke last week on "The Observation Problem in Atomic Physics." It is, it seems, a tough one for the meticulous physicist. If you know where an electron is, you cannot measure its velocity; if you know its velocity, you cannot know where it is. There is also the difficulty of stopping time in its tracks while making an observation. It should be done, but it's impossible...