1 Angina Pectoris: It is described as a pain located at the back of the breast bone which may be sharp or dull. This sensation may radiate or crawl to the hand, arm, left shoulder, or jaw.  Vasculitis: When the small to medium sized arteries are inflamed, head tingling and numbness may result.
Most species of shark eat things like fish, crustaceans, mollusks, plankton, krill, marine mammals and other sharks. Sharks also have a very acute sense of smell that allows them to detect blood in the water from miles away.
1 Sharks can smell a drop of blood within a million drops of water or, in a slightly less scientific way, say a teaspoon of blood in an Olympic sized swimming pool and can smell blood hundreds of meters away.  Before sandpaper was developed shark skin was used to sand wood due to the rough dermal denticles.