Why do we yawn?

THE TRUTH IS that we don’t completely understand why people, or animals for that matter, yawn.

It’s widely assumed that yawning occurs because we are tired or bored or because we see someone else doing it, but there isn’t any hard evidence to support these beliefs.

Scientists do not purport to know all of the biological mechanisms of the yawn, but tend to agree that a yawn is an involuntary respiratory reflex, which regulates the carbon dioxide and oxygen levels in the blood.

Technically, a yawn is the reflex opening of the mouth followed by the deep inhalation and slow exhalation of oxygen.

The very act of yawning is but one of a number of involuntary reflexes controlled by the spinal and nerve centers.

Scientists speculate that the onset of a yawn is triggered either by fatigue, or by sheer boredom as, at those times, breathing is shallow, and little oxygen is carried to the lungs by the oxygen-toting cardiovascular system.

When one yawns, his or her alertness is heightened, as the sudden intake of oxygen increases the heart rate, rids the lungs and the bloodstream of the carbon dioxide buildup, and forces oxygen through blood vessels in the brain, while restoring normal breathing and ventilating the lungs.

This quite plausible theory of yawning falls short of explaining many aspects of yawning. Scientists explain away the "contagious" nature of yawning, that is when one person's yawn triggers another nearby to yawn, as due to the power of suggestion, but are at a loss when attempting to explain why yawning occurs excessively in patients with lower brainstem damage or with multiple sclerosis.

Other unlocked mysteries include why fetuses in the womb yawn, when it is a well-known fact that they do not intake oxygen into their lungs until after live birth, or why individuals with high concentrations of oxygen in their blood streams yawn.

Until these questions are answered, do not assume that a person who yawns in your presence is bored with what you are saying, or suffers from exhaustion. Simply be pleased that he or she is not bored to death.

Women Vs. Men

Nicknames

If Laura, Suzanne, Debra and Rose go out for lunch, they will call each other Laura, Suzanne, Debra and Rose.

If Mike, Charlie, Bob and John go out, they will affectionately refer to each other as Fat Boy, Godzilla, Peanut-Head and Scrappy.

Eating Out

When the bill arrives, Mike, Charlie, Bob and John will each throw in a $10,even though it's only for $32.50. None of them will have anything smaller, and none will actually admit they want change back.

When the girls get their bill, out come the pocket calculators.

Money

A man will pay $2 for a $1 item he wants.

A woman will pay $1 for a $2 item that she doesn't want.

Bathrooms

A man has six items in his bathroom: a toothbrush, shaving cream, razor, a bar of soap, and a towel from the Holiday Inn.

The average number of items in the typical woman's bathroom is 337. A man would not be able to identify most of these items.

Arguments

A woman has the last word in any argument.

Anything a man says after that is the beginning of a new argument.

Future

A woman worries about the future until she gets a husband.
A man never worries about the future until he gets a wife.

Success

A successful man is one who makes more money than his wife can spend.
A successful woman is one who can find such a man.

Marriage

A woman marries a man expecting he will change, but he doesn't.
A man marries a woman expecting that she won't change and she does.

Dressing Up

A woman will dress up to go shopping, water the plants, empty the garbage, answer the phone, read a book, and get the mail.
A man will dress up for weddings and funerals.

Natural

Men wake up as good-looking as they went to bed.
Women somehow deteriorate during the night.

Ask your Boss for a salary increase!

One day an employee sends a letter to his boss asking for an increase in his salary!!!


Dear Bo$$,

In thi$ life, we all need $ome thing mo$t de$perately. I think you $hould be under$tanding the need$ of worker$, I am $ure you will gue$$ what I mean and re$pond $oon.

Your$ $incerely,

Employee

The next day, the employee received this letter of reply :

Dear, 

I kNOw you have been working Very hard. NOwadays, NOthing much has changed. You must have NOticed that our company is NOt doing NOticeably well as yet. NOw the newspapers are saying the world's leading ecoNOmists are NOt sure if the United States may go into aNOther recession. After the NOvember presidential elections things may turn bad . I have NOthing more to add NOw. You kNOw what I mean.

Yours truly,

Manager

GMAT

The Graduate Management Admission Test (GMAT) is a Computer-Adaptive standardized test in mathematics and the English language for measuring aptitude to succeed academically in graduate business studies. Business schools commonly use the test as one of many selection criteria for admission into graduate business administration programs (e.g. MBA, Master of Accountancy, etc.) principally in the United States, but also in other English-speaking countries. It is delivered via computer at various locations around the world.

(See: http://www.gmatonlinetest.com/)

Easy Conversations

http://www.eslyes.com/easydialogs/