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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
The FDA recognizes 118 routes of administration.
Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.
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.
As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.