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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.
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).
There are more bacteria in your mouth than there are people in the world.
Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.
![Some mangrove islands in the Florida Keys, which number in the thousands, are convenient places to t](https://biology-forums.com/gallery/47/medium_33_19_02_12_5_42_32_20702454.jpeg)
![Midway Island, an inhospitable atoll acquired in 1867, was valuable as a military base located midwa](https://biology-forums.com/gallery/47/medium_6_02_03_16_7_45_21_234011450.jpeg)