Apressure cooker is a pot whose lid can be tightly sealed to prevent gas from entering or escaping. even without knowing how big the pressure cooker is, or what altitude it is being used at, we can make predictions about how much force the lid will experience under different conditions.

colorectal cancer may also develop from areas of abnormal cells in the lining of the colon or rectum. this area of abnormal cells is called dysplasia and is more commonly seen in people with certain inflammatory diseases of the bowel such as crohn's disease or ulcerative colitis.

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue