June, 2008
Prolonged exposure to the sun can damage the pigment molecules in a strand of hair and can result in lighter colored hair.
May, 2008
According to the National Institute of Mental Health, mental disorders are the leading cause of disability in the U.S. and Canada for people between age 15 to 44.
January - April, 2008
A lost toenail takes about 6 months to grow back completely.
December, 2007
The average human eye can spot the glow of a burning candle at a distance of up to 14 miles.
November, 2007
Your body has over 70,000 miles of blood vessels. They could stretch around the Earth over 2.5 times!
October, 2007
A block of human bone about 2 cubic inches in size can support the weight of a full-grown African elephant.
June - September, 2007
If you yelled for 8 years, 7 months and 6 days, you would have produced enough sound energy to heat one cup of coffee.
May, 2007
Compared to other animals, human brains are big for our body.
April, 2007
Onions, apples and potatoes share the same taste molecules but emit different smell molecules. Their differing "tastes" are the way we experience their smells.
March, 2007
Women blink nearly twice as much as men.
February, 2007
According to the U.S. Census Bureau, Americans consumed 25.7 pounds of candy per person in 2005.
January, 2007
The average person will breathe about seventy five million gallons of air in a lifetime.
September - December, 2006
Blondes have more hair per square inch than brunettes and redheads.
August, 2006
Over 2,000,000 bacteria are living on your chin, cheeks and nose. No matter how hard you scrub your face, you can never get rid of all of them.
July, 2006
The largest joint in the human body is the knee.
June, 2006
Your eyes can see 7 to 10 million different colors.
May, 2006
The skin secretes antibacterial substances. These substances explain why you don't wake up in the morning with a layer of mold growing on your skin - most bacteria and spores that land on the skin die quickly.
April, 2006
A taste bud lasts about 10 days before it is replaced.
March, 2006
Your skin is thinnest on the eyelids and thickest on the palms of your hands and the soles of your feet.
January-February, 2006
A one-minute kiss works off 26 calories!
December, 2005
When you sneeze, air rushes out of your nose at a rate of about 100 miles per hour!
November, 2005
Baby teeth hold places for the adult teeth below. Without baby teeth as a guide, adult teeth would grow in crooked and crowded.
October, 2005
Your skull protects your brain, inner ear and eyes. It is made up of 22 separate bones.
September, 2005
Your skin makes a special oil that keeps out water. If you stay in water too long, this oil gets washed away and your skin wrinkles up!
August, 2005
The average person has 100 to 150 eyelashes on their upper lid.
July, 2005
The average person blinks their eyes about 11,500 times a day.
June, 2005
Similar to fingerprints, each person has a different tongue print.
May, 2005
Fingernails grow about four times faster than toenails.
April, 2005
Blinking one eye uses over 200 muscles.
March, 2005
Your right lung is shorter than your left lung by one-inch, however, its air capacity is greater. The right lung has three lobes; the left lung has only two.
February, 2005
Muscles hurt after exercise because the circulatory system cannot provide oxygen to muscle fibers quickly enough. Because of this, the muscles built up lactic acid. The acid causes soreness and stiffness.
January, 2005
A funny bone is not a bone at all. It is part of the ulnar nerve located at the back of the elbow.
December, 2004
More than half of the body's total body heat can be lost through the head. That is why it is equally as important to wear some type of hat on a cold day as it is to wear a sweater or jacket.
November, 2004
If you yelled for 8 years, 7 months and 6 days, you would have produced enough sound energy to heat one cup of coffee.
October, 2004
The largest joint in the human body is the knee.
September, 2004
Your brain weighs about three pounds, but more than two pounds of it is water.
August, 2004
You breathe in about 7 quarts of air every minute.
June-July, 2004
A cough moves air at a speed close to about 600 miles an hour.
May, 2004
Almost half of the human body's total weight is muscle.
August, 2003
When food enters the mouth to be chewed or swallowed, it is either cooled or warmed by the tissue inside the mouth to a more suitable temperature for digestion.
July, 2003
The ears and nose do not have bones inside them. Their inner supports are cartilage which is lighter and more flexible than bone. This is why the nose and ears can be bent.
June, 2003
Red blood cells make approximately 250,000 round trips in the body before returning to the bone marrow, where they were born, to die. Their life cycle is approximately four months.
May, 2003
Unlike other body cells, brain cells cannot regenerate. Once brain cells are damaged they are not replaced.
April, 2003
Humans have two sets of teeth. Twenty "baby teeth" are replaced at around 6-7 years of age with 32 "permanent teeth".
March, 2003
An allergy is your immune system overreacting to substances that are not harmful to other people. True allergies are reactions to substances called allergens.
February, 2003
The weight of skin on an average adult human is around 6 pounds.
January, 2003
A "bursa" is a fluid-filled sac located near a joint that helps muscles and tendons move freely. The shoulder joint has the most bursa, with eight.
December, 2002
Exercise builds much more than the heart. In addition to making the heart more resilient, it also lowers blood pressure, increases the elasticity of blood vessels and increases bone strength by helping bones absorb minerals.
November, 2002
The most common human blood type is O+. About 38 percent of the world population is O+. The rarest is AB-. Only 1 percent of the world is AB-.
October, 2002
The sound made when people moves their fingers rapidly, cracking their knuckles, is the sound of fluid rushing in to fill the space created between the joints.
September, 2002
The hyoid bone is the only bone in the human body that doesn't touch another bone. It is located above the larynx and anchors the tongue muscles.
August, 2002
Human fingernails grow faster than toenails. Both grow faster in the summer than in the winter.
July, 2002
Your stomach doesn't "tell" you when you're hungry. People who have had their stomachs removed still feel hungry. Hunger sensations are controlled by the hypothalamus, a small brain structure that senses what your body's food needs are.
June, 2002
The human skin secretes antibacterial substances as a defense. Most bacteria and spores that land on the skin die quickly.
May, 2002
The ears and nose do not have bones inside them. They are supported by cartilage, which is lighter and more flexible than bone. This is why your nose and ears can bend.
Apr, 2002
Muscles contract in waves to move the food down the esophagus. This means that food would get to a person's stomach, even if they were standing on their head.
Mar, 2002
The average person contains about eight ounces of salt, which helps muscles contract, digestion to occur, blood to flow, wounds to heal and fluids to be properly regulated.
Feb, 2002
Unlike other body cells, brain cells cannot regenerate. Once brain cells are damaged they cannot be replaced.
Jan, 2002
When your stomach fills with food, a chemical hormone is released into the bloodstream. When this chemical reaches the brain it tells your body to relax. This aids in digestion and is the reason we feel sleepy after a meal.
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