All I want to know about sharks

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My fear of sharks is acquired ... The sharks I dissected in college were just 1 feet in length, and babies, and single, and most importantly DEAD. LOL So I never thought of sharks as huge things till I saw Jaws. Most important scene I recall in it is Robert Shaw's death. I have tried to convince me that Sharks do not have sufficient brain to do all what was shown there. (Nor do snakes). But I may be wrong. Not going to personally confirm that. All I can say is I could pee in my pants if I ever spotted one... So have you all ever been near a shark and do they bite even when they are NOT HUNGRY? How do you know whether they are or not hungry...sigh. I wanted to see Japan. But I read about the crew of USS Indianapolis. So my doubts were, what is the point for shark to eat live meat...when half of it will fall off. It does not have plate or hands... Do sharks eat dead meat...they may be..after all the meat being thrown at them in aquariums is dead meat. Can sharks hear the screams...logically unlikely...at our level of sounds. Do they notice movements and attack...is it fear..or do they attack based on blocking of light... So would dead humans be devoured by them like vultures.