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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
Medication errors are more common among seriously ill patients than with those with minor conditions.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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.
The familiar sounds of your heart are made by the heart's valves as they open and close.
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