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    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.

    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.

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Online Drugstores: Upside And Downside :

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ARTICLE INFORMATION :

The article features online pharmacies as the most popular way of buying drugs in the USA and discusses the possible pitfalls that can arise out of obtaining drugs from some online pharmacies.

ARTICLE CONTENT :

Many people have already switched to online pharmacies and consider them a far more convenient way to purchase medicines. There are two primary reasons why people choose to purchase prescription medicines online. The first is financial. Because of the economic policy of the U.S. Health care, consumers frequently have to pay a much higher price for medications than customers overseas. The other reason is privacy. Some people prefer to purchase their prescription drugs from online pharmacies, even at a higher price, than to talk to a physician personally about medical conditions, such as depression, loss of hair, or erectile dysfunction.

Sales of antidepressant medicines, Viagra, Propecia, and diet pills, such as Phentermine or Xenical, are a flourishing business today. For years, consumers near Canada have driven across the border to buy medicines at an affordable price from Canadian pharmacies. These days, customers nationwide can buy from a Canadian pharmacy by mail. Canadian pharmacies typically require an identification document and a valid prescription. Unless issued by a doctor who is besides accredited to practice medicine in Canada, U.S. Prescription drugs will be reissued by a Canadian doctor.

As Internet pharmacies gain a larger share of the prescription medication market, consumers must be aware of the possible problems associated with purchasing an online prescription for a drug, or buying a medication online. These issues get even more significant when ordering from overseas pharmacies. It is usually possible to obtain savings by buying prescription medications online, even from a major U.S. Pharmacy, when you have a prescription issued to you personally.

It is commonly not cheaper to purchase medications through an online prescription service, which usually marks up the price substantially even when nominally offering a prescription for free. That mark-up may be compared to the cost of an in-person medical examination, and may considerably exceed that cost when you need a refill. Also, as mentioned above, price cannot always be the leading factor. If you don't know for certain whether you will be shipped the actual drug which was prescribed for you, think twice before ordering.

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