A great white shark was spotted off Stinson Beach in Marin over the weekend — and now swimming and surfing in deep water are prohibited through Thursday. Bay Area coastal waters are part of the so-called “Red Triangle” because of the large number of great whites patrolling the waters for prey. How big of a threat do these sharks pose to humans?
Great White Shark Sighting

(Gianluigi Guercia/AFP/Getty)
Guests:
Douglas Long, chief curator of natural sciences at the Oakland Museum of California and research associate at the California Academy of Sciences
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