Why does Labor Begin?

What starts labor is one of the great mysteries of medicine. "That's a Nobel prize-winning question," says Dr. Mark Taslimi, a professor of obstetrics and gynecology at Lucille Packard Children's Hospital in Palo Alto, California.

One current theory is that stress hormones are released from the adrenal gland of the baby, which creates chemical changes in the placenta that cause the muscle of the uterus to develop involuntary contractions that turn into labor, he says. These regular, frequent contractions and the resulting opening of the cervix signal that labor has begun..

Why Dogs Turn Around Three Times Before Lying Down?

According to American humorist Robert Benchley, a dog teaches a boy three things: fidelity, perseverance, and to turn around three times before lying down.

If you've ever wondered why dogs turn around several times before flopping down on the floor, the answer is simple genetics. They've been genetically programmed to trample their sleeping areas in the wild so that the grass is tamped down to make a comfortable resting place.

Although your dog have the finest dog bed money can buy, he still feels the urge to circle before lying down, even in the comfort of the modern home. It's nature at work. Nature is the reason dogs gobble their food. The most successful survivors were able to eat fast before other members of the pack could grab a share. Wild dog cousins didn't know when his next meal would come, so being the fastest gorger was a real advantage.

SOURCE: PETPLACE.COM


Books to Read:
The Dog Whisperer: Vol 2 - Solving Common Behavior Problems
The Domestic Dog: Its Evolution, Behaviour and Interactions with People
Be the Pack Leader: Use Cesar's Way to Transform Your Dog . . . and Your Life
Am I Safe? The Art & Science of Canine Behavior Assessments

Why Does Lightning Flash?

An example of a single lightning flash making contact with the ground in 2 different places. Photo: Copyright Steve Hodanish.

As the atmosphere heats and cools. It expands and contracts, causing changes in pressure and air movement. Water droplets inside clouds have a positive electrical charge at the top of the cloud and a negative charge at the bottom.

When the negative charge comes near enough to an attracting positive charge on the Earth below or on another cloud, the electrical energy is released in a flash of light. There may also be a loud bang, called thunder, at the same time. This is caused by the air being heated to a tremendous temperature, and the explosive noise is when it expands suddenly.

However, as light travels faster through the air than sound, we see the lightning flash before hearing the thunder.

FACT:

Magnetic energy produced by vast storms on the Sun’s surface strikes the upper atmosphere of the Earth, producing patterns in the sky near the poles called the Northern Lights or aurora borealis.

Why do onions make you cry?

Onions are made of cells just like other plants. The cells are divided into two sections separated by a membrane.One side of the membrane contains an enzyme which helps chemical processes occur in your body. The other side of the membrane contains molecules that contain sulfur.The contents on each side of the membrane when you cut an onion will mix and cause a chemical reaction. This will produce molecules such as ethylsufine which make your eyes water.

To prevent crying when you cut an onion;

• Cut it under a running tap of cold water.

"The sulfur compounds dissolve in water and are rinsed down the sink before they reach your eyes."

• You can also put the onion in the freezer for ten minutes before you cut it.

"Cold temperatures slow down the reaction between the enzyme and the sulfur compounds so fewer of the burning molecules will reach your eyes."

Do You Know Why We Look Like Our Parents?

Do you often wonder why a child resemble their parents?

The characteristics of individual beings are passed from one generation to the next in their chromosomes. But it doesn't mean that a person lost it's uniqueness. Each of our parents gives us 23 chromosomes, making 46 in all. That means that we have two versions of our genes, but one is often dominant. We can see the effect of a dominant gene, but the recessive gene is still there and can be passed on to our children.

What are these chromosomes? Chromosomes are tiny threads that are present in all cell apart from our red blood cells. They contain all the information from an en tire person to develop. There is a special pair that actually determines a persons sex.

Short sections of a chromosomes are called genes. Each genes carries the instructions for a specific characteristic such us an eye color, hair color, height and etc. Many of these genes work with other genes, so it is not easy to say what effects they will have. At the moment the mother's egg is fertilized, the genes starts issuing instructions for the molding of a new human being. Every characteristics that we inherited from our parents will be passed through the coding of the genes within the chromosome and will be passed down to the next generation.

Fact: The gene for brown eyes is the dominant gene. Two brown eye

genes give brown eyes, one brown gene and blue gene usually

give brown eyes. Two blue eyes genes give blue eyes.