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Mutualisms, such as those that occur among plants and pollinators, generally involve large numbers o
Like most world-changing inventions, the printing press of fifteenth-century Europe took advantage o
William Masters and Virginia Johnson are among the most influential researchers in the history of th
Fine motor skills involve coordinating the many small muscles of the wrists, hands, and fingers.
This couple, a brother and sister in Germany and the proud parents of this child, are challenging ...
Measles rash. (© Lowell Georgia/Science Source/Photo Researchers, Inc.)