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Survival instincts: Visitors will find out why some creatures thrive and others fail to survive in an exhibit called “Our Weakening Web: The Story of Extinction,” which travels back as far as the time of the trilobites and Tyrannosaurus (Chicago Academy of Sciences, 2001 N. Clark St., running through Sept. 25) Interactive games and a puppet show illustrate the part that humans can play; $2 adults, $1 children. 312-871-2668.