What diseases were there in the trench in World War 1? Trenche foot was very common in the trench warfare. caused from wet feet and not being able to change their socks and boots. Edit
Repels Sharks No.........human urine actually repells sharks and other fish.
Can sharks smell blood from 2.5 miles away? yes they can process the particles in the water that contain really small parts of blood. From that they know which way to go to find the food. saw on discovery or history channel that they can smell one drop of blood from three miles away. have no idea how they can do it.