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There are more nerve cells in one human brain than there are stars in the Milky Way.
Thyroid conditions may make getting pregnant impossible.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
Adults are resistant to the bacterium that causes Botulism. These bacteria thrive in honey – therefore, honey should never be given to infants since their immune systems are not yet resistant.
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).