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Approximately 500,000 babies are born each year in the United States to teenage mothers.
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.
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.
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.