You, by the Numbers

posted by Emily Spilko
filed under general postings

You probably never think about all the things going on inside of you. Don't you think it's about time you got to know yourself a little better? Here's your chance. This is all about you—by the numbers.

Your Hair:

- A healthy head of hair has anywhere from 80,000 to 150,000 hairs; brunettes tend to have 115,000 hairs, blondes have 140,000, and redheads have about 100,000.

- Your hair grows at the rate of about a half inch every month.

- You lose 50 to 150 strands of hair per day.

- Half of us will be 50 percent gray by the time we reach the age of 50.

- Your genes determine whether you'll go bald. If baldness is on your genetic plate, you're not alone: About 60 percent of all men will be bald by the time they're 50.

Your Eyes:

- Each of your eyes measures about one inch in diameter.

- 20 percent of all people are nearsighted.

- If you have 20/20 vision, when you go for an eye exam you'll be able to read letters on the chart from 20 feet away.

Your Ears:

- Any sound that's louder than 85 decibels puts you at risk for hearing loss. (A rock concert checks in at 80 to 100 decibels; a jackhammer that's three feet away from you registers in at 120 decibels.)

Your Teeth:

- You have 32 permanent teeth, 16 in each jaw.

- At present, half of all 65-year-olds have lost all of their teeth.

Your Body:

- 15 to 20 percent of your body weight is from fat.

- On average, water makes up 60 percent of your body weight.

- You can determine roughly how many calories you burn just being alive by multiplying your weight in pounds by 12.

- Your muscles reach their maximum mass between the ages of 25 and 35.

- To find out whether your body is a pear or an apple, determine your waist-to-hip ratio: Divide your waist measurement by your hip measurement. For women: If the outcome is greater than .80, you are more like an apple; if it's lower, you're more pear. For men: If your calculations show a number larger than .95, you are more like an apple than a pear. (Unfortunately, "apple-shaped" individuals may be more susceptible than others to hypertension and heart disease.)

Your Heart:

- At rest, your heart beats 60 to 80 beats per minute and will contract more than 2.5 billion times in your lifetime.

- Your heart pumps out about 12 pints of blood per minute.

- When you exercise, your heart can beat up to 200 times—and pump out 100 pints of blood—per minute.

Your Skin:

- Your body is covered with two square yards of skin.

- Collagen—a tough, fibrous protein that holds together cells and tissues—makes up approximately 90 percent of your skin.

Your Bones:

- You have 206 bones in your body.

Your Hands and Feet:

- Your fingernails take approximately six months to grow from base to tip.

- Toenails take almost twice as long to grow out.

- Nails tend to grow faster in hot weather.

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