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    POLYPROPYLENE
    November 12, 1999 - Bartlesville, Oklahoma, U.S.A.

    In Bartlesville, Oklahoma, a plaque was placed on the site of the laboratory where the polymer polypropylene was invented, designating it a National Historic Chemical Landmark by the American Chemical Society. The first commercially successful use of the new material was in the Hula Hoop®. In 1951, J. Paul Hogan and Robert L. Banks, research chemists working for Phillips Petroleum Company, discovered the polymer unexpectedly during experiments with catalysts while trying to convert the natural gas components ethylene and propylene into compounds useful for gasoline. Later, they also developed a new catalytic process for making high-density polyethylene. Phillips soon invested in new plastic manufacturing plants.

    PITOT TUBE
    November 12, 1732 - Academy of Sciences, Paris

    Henri Pitot read a paper to the Royal Academy of Sciences in Paris about an instrument he had invented to measure the flow velocity at different depths of water in the River Seine. It had a scale and two open vertical glass tubes on a wood frame. The lower end of one pointed down, the other bent at 90 facing the flow. The belief of the time was that flow velocity at a given depth was proportional to the mass above it, meaning increasing velocity at greater depth. Recording the difference in liquid levels in the two tubes, he showed the opposite was true. Henri Darcy improved the design, with the support of Henri Bazin. Today, the Pitot tube has an important application in aerodynamics for the measurement of the airspeed of aircraft.

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  • Until a man duplicates a blade of grass
    by Earth Day, Thomas Alva Edison Inventor

    "...Until a man duplicates a blade of grass, Nature can laugh at his so-called scientific knowledge. Remedies from chemicals will never stand in favorable comparison with the products of Nature, the living cell of a plant, the final result of the rays of the sun, the mother of all life...."
  • A Change is Gonna Come
    by Meredith Grey

    "...Change; we don't like it, we fear it, but we can't stop it from coming. We either adapt to change, or we get left behind. It hurts to grow, anybody who tells you it doesn't is lying. But here's the truth: Sometimes the more things change, the more they stay the same. And sometimes, oh, sometimes change is good. Sometimes change is everything...."

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  • Cancer Facts & Figures
    about Besides Lung Cancer

    Besides lung cancer, tobacco use also increases the risk for cancers of the mouth, lips, nasal cavity (nose) and sinuses, larynx (voice box), pharynx (throat), esophagus (swallowing tube), stomach, pancreas, kidney, bladder, uterus, cervix, colon/rectum, ovary (mucinous), and acute myeloid leukemia. Harvard Medical School
    about Eyesight Myth and Fact

    Myth: Staring at a computer screen all day is harmful to the eyes. Fact: Spending the day staring at a screen can tire or strain your eyes, but it will not hurt them. Make sure lighting doesn't create a glare on your screen. When spending long periods at your keyboard, take a break now and then to rest your eyes to reduce fatigue. Also, don't forget to blink. Your eyes need to stay lubricated to feel comfortable.

Choose your wedding ring :

Choose Your Color :

ARTICLE INFORMATION :

The wedding ring is your partner for lifetime and there are several choices to make in choosing the material for your wedding ring.

ARTICLE CONTENT :

A wedding ring is the partner of your lifetime, therefore you should always choose your wedding ring according to your taste, and it should be such so that you can wear it all the time for your whole life. The custom of the exchange of the ring is a traditional one. According to the historians this custom of the exchange of the wedding rings during the time of wedding dates back to the ancient Egyptian civilization. The custom which started in the deserts of Africa gradually spread throughout the world and in the present day context in almost every country and in almost all the cultures this is a common custom that the bride and the groom exchange their wedding ring at the time of their wedding.

As the tradition came across the ages there came several changes in the tradition. But still the basic concept remains the same. It is believed that with the exchange of the wedding ring the souls of the couple are united with each other. Therefore, the wedding is considered as the event of the union of the two souls. However, there are several myths and beliefs associated with the custom of the exchange of the wedding rings.

One of such belief regarding the custom of the wedding ring is that it is believed that the wedding ring should be worn on the fourth finger of the left hand. And even a logic is presented in the support of this belief. It is believed that there is a nerve on that very finger which grows from the left hand ring finger and goes straight to the heart and therefore wearing the wedding ring on that very finger means keeping your beloved closest to your heart.

However, this is logic does not have any factual base as according to the medical science and the scientific view point there is no existence of any such vein and therefore the belief is also baseless. But that does not stop men from wearing the ring on the ring finger of the left hand. There is rather a different logic which can be presented in this respect. And the logic is that it is better to wear the ring on the left hand ring finger as the this is the finger of our both hands which is the least used.

And therefore wearing the wedding ring on that finger means that the ring would be much safer there. There is less chance of the ring or the precious stone in it getting damaged. Thus most of the people prefer to wear their wedding ring on the fourth finger of the left hand. This is a better idea of keeping the ring is safer condition.

There are several materials by which the wedding ring can be made. As in the most common cases the gold is the most favored choice for the metal for the wedding ring but other than that there are other metals also like platinum and titanium. Even the white gold rings are quite favorite these days.

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