"John A. Musick and Beverly McMillan bring us along on a thrilling adventure as they chase sharks from Bear Gulch, Montana to a whale shark-feeding station in Okinawa ... En route we discover that sharks navigate using electromagnetic signals, have a bloodhound's sense of smell, are both cold- and warm-blooded, and possess biochemical weapons, which, used properly, might indeed help fend off malignant tumors and microbes." (Quoted from site)