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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
GI conditions that will keep you out of the U.S. armed services include ulcers, varices, fistulas, esophagitis, gastritis, congenital abnormalities, inflammatory bowel disease, enteritis, colitis, proctitis, duodenal diverticula, malabsorption syndromes, hepatitis, cirrhosis, cysts, abscesses, pancreatitis, polyps, certain hemorrhoids, splenomegaly, hernias, recent abdominal surgery, GI bypass or stomach stapling, and artificial GI openings.
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.