Changes

===Cancer===

===Cancer===

Cancer (malignant neoplasms) is the second most common cause of death in the United States, with 559,000 deaths in 2002. Although known to antiquity, cancer was not a major killer until the 20th century, when it replaced tuberculosis as the most dreaded disease. The incidence varies dramatically across the world. The main causes of cancer are environmental hazards such as radiation exposure, pollutants and chemicals, especially asbestos and nicotine. There are about 150 varieties of cancer, affecting different organs. A few rare forms of cancer are caused by viruses, but in general it is not an infectious or communicable disease. Over a million new cases a year are diagnosed, and about half these people survive five years. The most common types are lung cancer (with only 12% surviving 5 years), breast cancer (80% survival), colon cancer (60%), and prostrate cancer (80%).  

{{main}Cancer}}

[[Cancer]] (malignant neoplasms) is the second most common cause of death in the United States, with 559,000 deaths in 2002. Although known to antiquity, cancer was not a major killer until the 20th century, when it replaced tuberculosis as the most dreaded disease. The incidence varies dramatically across the world. The main causes of cancer are environmental hazards such as radiation exposure, pollutants and chemicals, especially asbestos and nicotine. There are about 150 varieties of cancer, affecting different organs. A few rare forms of cancer are caused by viruses, but in general it is not an infectious or communicable disease. Over a million new cases a year are diagnosed, and about half these people survive five years. The most common types are lung cancer (with only 12% surviving 5 years), breast cancer (80% survival), colon cancer (60%), and prostrate cancer (80%).

===Violence===

===Violence===