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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
Thyroid conditions may make getting pregnant impossible.
Although the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better.
Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.