The short-term memory capacity for most people is between five and nine items or digits. This is one reason that phone numbers were kept to seven digits (not including area code).
Synesthesia is a rare condition in which the senses are combined. Synesthetes see words, taste colors and shapes, and feel flavors.
The simple act of walking requires the use of 200 muscles in the human body. 40 or so will lift your leg and move it forward.
The African bushman lives in a quiet, remote environment and has no measurable hearing loss at age 60.
The size of your foot is approximately the size of your forearm.
The average adult has between 40 and 50 billion fat cells.
The average adult stands 0.4 inch (1 cm) taller in the morning than in the evening, because the cartilage in the spine compresses during the day.
The skeleton of an average 160 pound body weighs about 29 pounds.
The skin is only about as deep as the tip of a ball-point pen. First-degree burns affect only the very top layers of the skin; second-degree burns, midway through the skin's thickness. Third-degree burns penetrate and damage the entire thickness of the skin.
The skin of the armpits can harbor up to 516,000 bacteria per square inch, while drier areas, such as the forearm, have only about 13,000 bacteria per square inch.
The soft mass of the adult brain is motionless. Though it consumes up to 25 percent of the blood's oxygen supply, it does not grow, divide, or contract.
The sound of a snore (up to 69 decibels) can be almost as loud as the noise of a pneumatic drill (70–90 decibels).
The strongest bone in the body, the thigh bone, is hollow. Ounce for ounce, it has a greater pressure tolerance and bearing strength than a rod of equivalent size in cast steel.
The strongest muscle in the body is the tongue.
The substance that human blood resembles most closely in terms of chemical composition in sea water.
The swine flu vaccine in 1976 caused more death and illness than the disease it was intended to prevent.
The thumb is such a major player in the human body that it has a special section, separate from the area that controls the fingers, reserved for it in the brain.
"Mageiricophobia" is the intense fear of having to cook.
“Villi”, finger-like projections on the small intestine (their purpose is to increase the surface area for water and nutrient absorption) are four-hundredths of an inch long.
25 trillion cells travel through the bloodstream – a stack of 500 would only measure 0.04 inches high.
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