Best known as scavengers of the dead and dying, sharks have well-
honed sensors with which they can track the sounds of other injured
and struggling beings. They are also equipped with fine sense of
smell that allow them to detect minute dilutions of blood (one part
blood to one million parts water) up to one-quarter mile away.
Precisely the distance a hopeful personal injury lawyer will run
behind an ambulance to toss a business card.