A silver spoon.
D000818:Animals; D000830:Animals, Laboratory; D001703:Biophysics / Q000266:history; D002196:Capillaries / Q000502:physiology; D002463:Cell Membrane Permeability; D004739:England; D006041:Goats / Q000502:physiology; D049673:History, 20th Century; D006801:Humans; D010827:Physiology / Q000266:history; D012890:Sleep / Q000502:physiology; D014481:United States