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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
Liver spots have nothing whatsoever to do with the liver. They are a type of freckles commonly seen in older adults who have been out in the sun without sufficient sunscreen.
Cyanide works by making the human body unable to use oxygen.
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.