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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.
Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.