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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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ARTICLE INFORMATION :

Learn more about online computer games. The article describes the advantages of playing flash games, such as good relaxation, brain training and memory development.

ARTICLE CONTENT :

Can you imagine your life with no personal computer. Most people will definitely answer no to this question. We work on PC when we are at the office. As soon as we come home the first thing we do is turning on our computer. We only turn it off for nights, but in the recent time with the development of technical progress there appeared a chance to download significant volumes of information, for example videos or music, from the Internet.

Downloading takes some time, so people prefer to keep their PC turned on during night and to download. Useful software, the World Wide Web, computer flash games ? we're so used to their presence in our living that it is scarcely conceivable that they can unexpectedly disappear.
Attitude of people to computer games is different. For some of them playing computer flash games is the most favorite hobby and the best way to relax after a hard working day. Some people find them amusing and sometimes spare some time to this kind of activity.

But there is also a category of people that consider computer games to be a total waste of time. They suppose that playing computer flash games destroys people's brain. Actually, flash computer games are really a great source of relaxation. What's more, it was confirmed by scientists that playing flash games affects positively the activity of our brain. Just imagine the situation when you're concentrated on playing a computer flash game. You're attentive to details and always try to think ahead.

That implies that playing flash games develop your thinking abilities and quick reaction ability. But still, computer games should not become the only thing you take interest in. Firstly, spending too much time in front of the monitor has a negative influence on your eyesight. Moreover, take into account that the game is a virtual reality and you should not change your real life with playing flash games. Use playing computer flash games as a way to relax and to exercise your brain and you'll get only positive effect.

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