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Some male birds and mammals congregate in communal courting grounds called leks.
Angioplasty. One form is called balloon angioplasty, shown here. A balloon catheter is threaded into
Diphtheria. The bacteria that cause this disease, called Corynebacterium diphtheriae, proliferate in
Luna Park at Coney Island was a vast living theater in which strollers were both spectators and acto
Cutting a Fillet
A thin cleft, called the synapse, separates one cell from another.