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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.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.