CATEGORIES

TODAY IN HISTORY

    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.

MEMBER LOGIN

RANDOM QUOTES

  • The wealth of the nation
    by Earth Day, Gaylord Nelson

    "...The wealth of the nation is its air, water, soil, forests, minerals, rivers, lakes, oceans, scenic beauty, wildlife habitats and biodiversity that'as all there is. That'as the whole economy. That'as where all the economic activity and jobs come from. These biological systems are the sustaining wealth of the world...."
  • No Man is Above the Law
    by Theodore Roosevelt

    "..."No man is above the law and no man is below it; nor do we ask any man's permission when we require him to obey it. Obedience to the law is demanded as a right; not asked as a favor."..."

RANDOM FACTS

  • More vehicles
    about Stolen On New Year's

    More vehicles are stolen on New Year's Day than any other holiday throughout the year. (So does that mean thieves are having their last fling before changing their ways or are they trying for a big score to start the New Year?) 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.

Free Dir :

Choose Your Color :

Category Information : Free Dir

This is our Free Dir category. If you are interested in Free Dir, feel free to browse these listings. If you have a site that fits within this category, Submit it for inclusion.
Sort by :RANKHITSTITLE

LINK LISTINGS :

Website preview thumbnail for : The W3b Index
A general web directory offering free link submissions for webmasters to promote and popularize their sites. Reciprocal and featured listings have multiple deep linking options, along with prompt i...
http://www.thew3bindex.com
Website preview thumbnail for : Rank Based Listings
We are a Free Link Directory; You can submit your website links here for free. We are a human reviewed business web directory with directory search.
http://rankbasedlistings.com
Website preview thumbnail for : List Of Directories
List-directories, search engine friendly directory lists and link building resources. Find the best article, general, free and niche directories. Use our resources to build some serious back links!
http://www.list-directories.com
Website preview thumbnail for : Free Directory List.
The list of free Directory are more than 3100 directories from across the globe. Feel free to submit to the list of free, paid and reciprocal directories.
http://directorysubmission.sammrat.com
Website preview thumbnail for : Tower Promote
We are a Free link directory, Website submissions human reviewed business web directory with directory search.
http://www.towerpromote.com

There is no news in this category!
There are no articles in this category! Add an article listing today!

Featured Link Listings (random) :

A random section of our Featured link listings :
Website preview thumbnail for : Search Office Space
Search Office Space was founded in 1993 by Richard Smith in order to bring together all elements of the serviced office space market into one convenient single point of contact, with clients having...
http://www.searchofficespace.com
Website preview thumbnail for : Kidzter
A lots of free online games and other free games are available at kidztar. Therefore it is the best place for your kid's entertainment.
http://www.kidzter.com
Website preview thumbnail for : Alive Network & Entertainment Agency
Has grown into the largest supplier of live entertainment for weddings, corporate events and private parties in the UK. With over 90,000 previous customers and an artist roster of over 1750 bands, ...
http://www.alivenetwork.com
Website preview thumbnail for : Its A Baby
We are a Bury UK based retailer of a wide range of baby and children's products. We specialise in offering prams & pushchairs.
http://www.itsababy.co.uk

Video Listings :

A selction of listings chosen randomly that contain embedded videos.

Featured Article Listings (random) :

A random section of our Featured Article listings :
Just a line to say I'm living, That I'm not among the dead Though I'm getting more forgetful And more mixed up in the head.
In this highly competitive market, people are looking out for effective ways to improve their businesses.
No matter what else you are doing from cradle days through to the end, You're writing your Life's secret story, Each night sees another page penned.
Unfortunately just like humans our pets will age too. With the aging process comes health problems and with health problems comes very expensive vet bills. Research you dog

Title for tab4 content :

What to you want here?