Scientists are unable to fully explain why a number of sharks approached the beach at Beit Yanai in central Israel last week, apparently for the first time. The harmless dusky sharks were spotted Thursday close to the point where the Alexander River meets the Mediterranean Sea. Sudden heat events typical of the season are known to cause mass fish die-offs in the streams that drain into the sea. The warmer the water, the less oxygen the fish have to breathe. The dead fish are washed down to the shallow waters of the sea, where they draw the sharks who are able to freely dine.