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Photograph of a person with a cataract in the right eye.
Richmond, Virginia, lies in ruins in April 1865 at the time of Lincoln’s visit—and a few days before
Early in the twentieth century, when malnutrition was common, companies such as this one advertised
Time course and phases of a nerve cell going from resting potential to action potential
When young infants hold objects for a long period of time they eventually become habituated to them.
Earth scientists have devised a scheme to divide the planet’s natural history into distinct time ...