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Thyroid conditions may make getting pregnant impossible.
Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).
Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.
In 1844, Charles Goodyear obtained the first patent for a rubber condom.

