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Some male birds and mammals congregate in communal courting grounds called leks.
Male mandarin duck flying in Dublin, Ireland
Arthroscopic surgery. In this illustration, the knee joint is undergoing surgery with a specialized
Luna Park at Coney Island was a vast living theater in which strollers were both spectators and acto
Colon with diverticulosis. An inflamed or infected diverticulum is called diverticulitis.
Detonation is a secondary ignition of the air–fuel mixture. It is also called spark knock or ...