National Geographic : 1939 Nov
FROM NATURE'S HIDDEN BUILDING BLOCKS TOUGH BEEF BECOMES TENDER BY EXPOSURE TO ULTRAVIOLET RAYS Each year the United States eats nearly 4,000,000 tons of beef, much of it tough. Now Dr. M. D . Coulter, of Mellon Institute, has found this new way to tenderize it quickly. J Avatl ill! Ocogrlapllll o lety ouGacUnro esUy vvlllar 1 . .- uIver WITH BRISTLES NOW MADE OF COAL, SIBERIAN WILD HOGS GRUNT IN GLEE "Nylon," du Pont's mysterious new textile, is formed and hardened into durable toothbrush bristles. Here in a shop at Leominster, Massachusetts, a machine punches holes in the brush handle, sets the bristles, and fastens them (Plate XIII).