Mercury can cause many affect to us. Mercury affects the human brain, spinal cord, kidneys and liver. It affects the ability to feel, see, taste and move. Symptoms include tingling sensations in the fingers and toes, a numb sensation around the mouth and tunnel vision. Long-term exposure can lead to personality changes, stupor and coma. Pregnant women and young children are the most vulnerable to mercury posioning. It can also affect the development of an unborn fetus, causing birth defects. The most common way of getting mercury posioning is by mouth. Usually by eating contaminated fish. Fact- A mercury fever thermometer contains enough mercury to potentially contaminate 9,000 cans of tuna fish. Isn't that crazy?