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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.
Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
The average adult has about 21 square feet of skin.
Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.
The toxic levels for lithium carbonate are close to the therapeutic levels. Signs of toxicity include fine hand tremor, polyuria, mild thirst, nausea, general discomfort, diarrhea, vomiting, drowsiness, muscular weakness, lack of coordination, ataxia, giddiness, tinnitus, and blurred vision.