Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
Pneumothorax; A, penetrating wound; B, ruptured bleb on the lung.
Gastric cancer. In advanced stages of gastric cancer, malignant cells spread to form tumors in the l