The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.
Endothelial cells under the microscope.
Whitefish blastula cells
Major Causes of Death in U.S by Age Group
Peer group activity of adolescents
Each enzyme functions best within a characteristic range of pH