A web directory unlike a search engine does not list websites according to any keyword but according to the categories they belong to. A link of all the websites listed under each category is provided so that the viewer can connect to the site after he reads about it. The categories and sub categories may vary from directory to directory, a list of categories from a directory could be like entertainment sites, poker sites, casino sites, bingo sites etc. There may also be other directories that vary in the kind of categories like say if the category is educational sites the websites listed could be under sub-categories like MBA colleges, medical colleges etc.

Websites to be listed on an internet directory have to be approved by the editor they cannot be automatically updated like on search engines. Editors view the content of each website submitted for approval and decide according to the terms and conditions of their directory. Therefore the traffic that comes through a directory is quality traffic and that which comes through a search engine is bulk or unsorted traffic. Search engines generally rank websites according to the number of web directories they are listed in and their order of priority in them. Each link is considered as a vote, thus more the links higher is the ranking of websites on search engines.

For new websites or small businesses looking for more traffic on their websites it is better to get their sites listed on internet directories rather than search engines, as search engines are vast and uncategorised where as directories are systematically organised under specific categories and the viewers searching for a site on a directory usually turn out potential customers whereas those on search engines could be just browsers .

It has replaced such procedures as dermabrasion for acne scarring so that recuperation is a fraction of what it had been.

It has replaced the absolute need for many surgical procedures such as facelifts and vein-stripping of varicose veins. It has become clear that one laser cannot be used for all medical purposes. What it does and how it affects the skin is determined by miniscule changes in light bandwidth, light photon power delivered by the device, and the length of the skin exposure to the light and most importantly is the cooling and removal of the unwanted heat from the site where the laser is administered.

If one looks at the entire spectrum of light, it is evident that the human eye only “sees” a fraction of the light which is present. In other words human vision can see light waves in the range of 400 to 1000 nanometers. This includes a portion of UV light and almost to the infrared area. Light is in discrete packets of energy called photons. Photons are released by electrons when they go from a higher energy state to a lower one. The way laser works is that it releases photons from an energized tube that are traveling parallel to another and at an equal energy composition. Some of the first medical work done was with a carbon dioxide laser. The light released was of a wide width, about 10,000 nanometers. It targeted water in the human skin, and was useful in cutting tissue, and at lower energy levels it could be used for laser resurfacing, though the skin surface would get very hot and recovery time was prolonged.

There are now a number of different lasers which release specific wavelengths of light. One of the first used was the Argon laser, who use is primarily limited these days to specialized eye and ear applications. Probably one of the well-accepted lasers these days is the YAG laser (Yttrium-Aluminum-Garnet). It is combined with Erbium, Neodymium and other elements to produce light at specific wavelengths which may target water, hemoglobin, melanin, or tattoo pigments in the skin. A laser’s propensity to target melanin makes it useful to target melanin in the root of a hair, and thus act as a hair-removal device. By targeting hemoglobin, it can explode tiny blood vessels which cause rosacea on the face. Other uses are based on specific pulse widths, amount and time of energy delivered, and known biological effects of each one.

There is another form of light therapy which is normally delivered either by the device itself or by way of the armature of a laser (through a boxed lens device) called BBL (broad-based light); it is often known as IPL with frequently replaced light bulb (intensive pulsed light).  If you have an IPL done check the usage of the bulb with the practitioner. A bulb costs about $ 10,000 and is effective for 10,000 flashes after which the results fade very quickly.  If they only charge $ 1.00 per flash you do the arithmetic.  This light therapy includes several wavelengths of light simultaneously such as light including everything from 480 to 1064 nanometers.  Certain filters can be put in the box to shield out certain wavelengths for specific purposes.

Lasers create a lot of heat in the skin by virtue of what they do. There are several techniques for making the procedure more comfortable. Many times an oral anti-anxiety medicine like diazepam is given prior to the procedure to alleviate fear and apprehension. The gel which is applied to the face as the procedure progresses may be refrigerated to decrease the heat. Most of the time a topical anesthetic containing one or more of the “-caine” drugs like xylocaine or mepivocaine is applied prior is applied prior to the procedure to numb the skin. Once the procedure is started there are ways to continuously cool the skin. One way is to blow cold air over the work field from a special cooler. Another way is an expensive sapphire glass which has coolant run directly through it at the site of the laser’s penetration. The discomfort usually abates a few minutes after the procedure is completed.

The laser techniques, in the hands of an experienced operator, are an excellent way to rid the skin of wrinkles, blemishes, acne scars, and the general effects of aging. The limited IPL’s that a lot of the spas are using simply cannot do the job in all cases. A patient, who is interested in a specific laser improvement to the face or other part of the body, should consult an experienced physician before embarking on any type of laser therapy.

John Drew Laurusonis

Doctors Medical Center 

www.doctorsmedicalctr.com

A good foundation in science through science education is required for all children, but the way that this education takes place is not strictly defined.

With that said, many schools will take to science experiments using hands-on science products and supplies. This is an excellent way for students to ‘see’ the science around them. Often times learning from a book can be tedious and will cause students to become uninterested in the subject matter. A science experiment, however, is interactive and forces the students to take part in science learning. These projects don’t have to be complicated and will usually result in a much higher level of learning retention.

There are a few reasons why children better retain knowledge gained through scientific experimentation. One is it allows you to appeal to those children who are visual learners. These students are the ones who need pictures or demonstrations to remember things.

Words just don’t stick in their minds as well, but when they can see a science demonstration or visualize an experiment, they can comprehend and retain the subject matter with much better success. Many students tend to thrive in science because it offers the visual aspect that many other subject matters do not.

Another reason that knowledge gained through science experimentation is retained longer by students is because they are actively engaged. They can’t simply skim through the experiment, they have to make sure that they are doing things correctly, and the only way to ensure that is by understanding what is going on. It forces students to understand the science behind what they are doing, and if they don’t, often times the experiment won’t turn out right.

Finally, hands-on science experimentation gives the student a sense of accomplishment. It is a reward of sorts, to have the experiment turn out correctly. That reassurance and sense of achievement at the end of each experiment will cause them to want to do more. It will also give them more confidence in what they are doing and possibly cause them to take up more science projects on their own. They will already be comfortable with the process they need to follow and will merely need their own ideas and theories to start their own projects. Even their own small science projects will increase their knowledge of how the world around them works and functions.

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