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There are more bacteria in your mouth than there are people in the world.
A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.
People about to have surgery must tell their health care providers about all supplements they take.
Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
![Vertebral compression Fractures of the spine (vertebra) can cause severe ”band-like” pain that radia](https://biology-forums.com/gallery/47/medium_14755_24_09_12_7_46_03_89701453.jpeg)
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![The S-curve in the human vertebral column--a result of the evolution of bipedality--makes humans hig](https://biology-forums.com/gallery/47/medium_273688_23_02_15_7_45_09_20852677.jpeg)