Sex Education in Schools Pros and Cons

Sex education is the act of informing younger and adult generations about everything they need to know about sex. Sex education is one of the most controversial issues in education, which has been floating on educational institutions since ages.

Sex education is not just about sex. It includes other sensitive issues like sexual health, sexual reproduction, sexuality and others that parents often feel uncomfortable talking with their children. Therefore, it becomes the responsibility of schools to address this issue, and inform and educate students about it as much as possible.

Often, sexual education in schools is considered as a recreational course rather than a serious issue. There are many pros and cons of sexual education being taught in the public schools.

Pros of sex education in schools:

– Classes are gender-exclusive. This saves embarrassment among students and teach them only what they need to know based on their gender.

– Properly taught, sexual education could become a regular and ongoing Human Anatomy and Biology complete with tests and grading that goes toward graduation credits.

– Students can be taught the correct terms of the reproductive system of sexually transmitted diseases and contraception birth instead of “street slang.”

– Myths surrounding sex can be dispelled (for example, can not get pregnant the first time).

– Studies show that many teenagers become sexually active before the inclusion of educational classes. Principles of inclusion of classes has been shown to help students stay or to abstain or at least be responsible if they are active.

– Proper education can have an impact on the prevention of sexual problems in adulthood.

Cons of sex education in schools:

– Students may still be subject to embarrassment or excitable by subject matter. This can make for out of control classrooms if students take to laugh or make inappropriate comments.

– Most education is taught as a brief interlude in physical education or health class. This is not enough time to relate effectively to serious material.

– Often, sexual education can go against moral or religious beliefs of an individual. Many schools do not teach abstinence-only, but to teach how to have sex safely, while many of the religious and family stress marriage before intercourse.

– Sex education is often seen as a “recreational” course and not a serious issue (this is a direct correlation with the fact that there are no grades or scores to be derived from class).

– Teachers are not always adequately trained to teach sexual education and may violate their own beliefs or morals on the subject rather than continuing with the facts.

– The attitudes of parents, educators and religious leaders in the community can make the stuff that vary from state to state or even school-to-school.

Wide Area Network (WAN)

Types and Characteristics of WANs

What is a WAN?

There are two prevailing definitions of a Wide Area Network (WAN). The book definition of a WAN is a network that spans large geographical locations, usually to interconnect multiple Local Area Networks (LANs). The practical definition of a WAN is a network that traverses a public network or commercial carrier, using one of several WAN technologies

What are its Main Components?

The main components for a WAN are routers, switches and modems. These components are described below in the hardware section.

CPE – Devices on the subscriber premises are called customer premises equipment (CPE).

The subscriber owns the CPE or leases the CPE from the service provider. A copper or fiber cable connects the CPE to the service provider’s nearest exchange or central office. This cabling is often called the local loop, or “last-mile”.

DTE/DCE – Devices that put data on the local loop are called data circuit-terminating equipment, or data communications equipment (DCE). The customer devices that pass the data to the DCE are called data terminal equipment (DTE). The DCE primarily provides an interface for the DTE into the communication link on the WAN cloud.


In a WAN you will need various types of hardware components for it to function. The typical items of hardware that you will need in a WAN are:

Router – An electronic device that connects a local area network (LAN) to a wide area network (WAN) and handles the task of routing messages between the two networks. Operates at layer 3, and makes decisions using IP addresses.

Switch – A switch is a network device that selects a path or circuit for sending a unit of data to its next destination. Operates at layer 2, and uses MAC addresses to send data to correct destination.

Modem – Short for modulator/demodulator, a modem enables a computer to communicate with other computers over telephone lines. Operates at layer 1, where signals are converted from digital to analogue and vice versa for transmission and receiving.

Wan Standards

WANs operate within the OSI model using layer 1 and layer 2 levels. The data link layer and the physical layer. The physical layer protocols describe how to provide electrical, mechanical and functional connections to the services provided by the ISP. The data link layer defines how data is encapsulated for transmission to remote sites.


Encapsulation is the wrapping of data in a particular protocol header. Remember that WANs operate at the physical layer and the data link layer of the osi model and that higher layer protocols such as IP are encapsulated when sent across the WAN link. Serial interfaces support a wide range of WAN encapsulation types, which must be manually specified. These types include SDLC, PPP, Frame delay etc. Regardless of WAN encapsulation used it must be identical on both sides of the point to point link.

Packet and Circuit Switching

Circuit switching and packet switching are both used in high-capacity networks.

The majority of switched networks today get data across the network

through packet switching.

Circuit-switching is more reliable than packet-switching. Circuit switching is old and expensive, packet switching is more modern.

General Routing Issues

What is a Routing Protocol?

A routing protocol is a protocol that specifies how routers communicate and exchange information on a network. Each router has prior knowledge of its immediate neighbours and knows the structure of the network topology. The routers know this because the routing protocol shares this information.


RIP (Routing Information Protocol) was one of the most commonly uses protocols on internal networks. Routers use RIP to dynamically adapt changes to the network connections and communicate information about which networks routers can reach and the distance between them. RIP is sometimes said to stand for Rest in Pieces in reference to the reputation that RIP has for breaking unexpectedly and rendering a network unable to function.

Routing Algorithms

Distance Vector

This type of routing protocol requires that each router simply inform its neighbours of its routing table. The distance vector protocol is also known as the bellman-ford algorithm.

Link State

This type of routing protocol requires that each router maintain a partial map of the network. The link state algorithm is also know as Dijkstra’s algorithm.


IGRP is a type of distance vector routing protocol invented by cisco used to exchange routing data in a autonomous system. Distance vector protocols measure distances and compare routes. Routers that use distance vector must send all or a portion of their routing table in a routing update message at regular intervals to each neighbour router.

Addressing and Routing

What does routing mean?

Routing is the process of deciding how to move packets from one network to another.

The directions also known as routes can be learned by a router using a routing protocol then the information is passed from router to router along the route of the destination.

IP Address’s

Every machine connected to the internet is assigned an IP address. An example of an IP address would be IP addresses are displayed in decimal format to make it easier for humans to understand but computers communicate in binary form. The four numbers that separate an IP address are called Octets. Each position consists of eight bits. When added to together you get 32 bit address. The purpose of each octet in an IP address is to create classes of IP addresses that can be assigned within a network. There are three main classes that we deal with Class A, B and C. The octets of an IP address are split into two parts Network and Host. In a class A address the first octet is the network portion, this determines which network the computer belongs to, the last octets of the address are the hosts that belong to the network.

Sub netting

Sub netting allows you to create multiple networks within a class A, B or C address. The subnet address is the address used by your LAN. In a Class C network address you would have a subnet mask of A subnet mask identifies which portion is network and which is host. For example the first octet three octets are the Network address and the last octet being the host(Workstation). It is important to subnet a network because gateways need to forward packets to other LANS. By giving each NIC on the gateway an IP address and a Subnet mask it allows the gateways to route packets from LAN to LAN. Once the packet arrives at its destination, the gateway then uses the bits of the subnet portion of the IP address to decide which LAN to send the packets.

Circuit Switched Leased Lines

A circuit switched network is one that establishes a dedicated circuit (or channel) between nodes and terminals before the users may communicate. Here are some terminologies associated with a Circuit switched network.

Frame relay is a telecommunication service designed for cost-efficient data transmission between local area networks (LANs)

Basic rate interference is a service used by small business for internet connectivity. An ISDN BRI provides two 64 Kbps digital channels to the user.

Primary rate interface (PRI) is a telecommunications standard for carrying voice and data transmissions between two locations

All data and voice channels are ISDN and operate at 64kbit/s

Packet Switching – _Toc80455261

Packet switching refers to protocols in which messages are broken up into small packets before they are sent. Each packet is then transmitted over the Internet. At the destination the packets are reassembled into the original message. Packet switching main difference from Circuit Switching is that that the communication lines are not dedicated to passing messages from the source to the destination. In Packet Switching, different messages can use the same network resources within the same time period.

Asynchronous Transfer Mode (ATM) is a cell relay, packet switching network and protocolwhich encodes data into small fixed-sized cells.

ISDN is used to carry voice, data, video and images across a telephone network. ISDN stands for integrated services Digital Network. Isdn also provides users with a 128kbps bandwidth. This is done through frame relay. Frame relay complements and provides a service between ISDN, which offers bandwidth at 128 Kbps and Asynchronous Transfer Mode which operates in somewhat similar fashion to frame relay but at speeds from 155.520 Mbps or 622.080 Mbps. Frame relay is based on the older X.25 packet switching technology and is used to transmit analogue signals such as telephone conversations.

PSDN stands for packet switched data network and is a data communication network. Packet switched networks do not establish a physical communication signal like the public telephone does (circuit switched network) Packets are sent on a fixed length basis and assigned with a source and a destination address. The packets then rely on the routers to read the address and route the packets through the network.

Mobile and Broadband Services

Digital Subscriber line(DSL) is mainly used to bring high bandwidth connections to homes and small business’s over a copper wire telephone line. This is can only be achieved if you stay within the range of the telephone exchange. DSL offers download rates of up to 6mbps allowing continuous transmission of video, audio and 3D effects. DSL is set to replace ISDN and compete with the cable modem in providing multimedia to homes. DSL works by connecting your telephone line to the telephone office over copper wires that are twisted together.

Asymmetric Digital Subscribers Line is most commonly used for home users. It provides a high download speed but a lower upload speed. Using ADSL, up to 6.1 megabits per second of data can be sent downstream and up to 640 Kbps upstream.

Symmetric Digital Subscriber Line is a digital subcriber line which runs over one pair of copper wires. The main difference between ADSL and SDSL is the difference in upload and download speeds. SDSL allows the same upstream data rate and downstream data rate as ADSL upstream can be very slow.


HDSL High bit-rate Digital Subscriber Line, one of the earliest forms of DSL, is used for wideband digital transmission within a corporate site and between the telephone company and a customer. The main characteristic of HDSL is that provides equal bandwidth in both directions.

IDSL is a system in which data is transmitted at 128 Kbps on a regular copper telephone line from a user to a destination using digital transmission.

The Local Loop enables operators to connect directly to the consumer via copper local loops and then add their own equipment to offer broadband and other services. This process involves operators accessing local exchange buildings to connect to a network of copper lines which connect them to homes and businesses. BT is an Example of a Local Exchange. The local loop connecting the telephone exchange to most subscribers is capable of carrying frequencies well beyond the 3.4 kHz upper limit.

Benefits of using DSL

DSL can provide virtually instantaneous transmission of voice, data and video over ordinary copper phone lines. A DSL connection can eliminate delays when waiting to download information and graphics from the Internet. It provides users with a cost effective high speed Internet connection. Another benefit is that a DSL connection is always on-line (like a LAN connection) with no waiting time for dialling or connecting.

There are now more than 10 million broadband connections in the UK. By December 2005 there were 9.792 million broadband connections in the UK and the average broadband take up rate during the three months to December was more than 70,000 per week.

Something Between The GS 300 And GS 400

Dissatisfied with the old GS 300, Lexus decided to start over, almost from scratch. The result is not one but two new cars: the GS 300, powered by an in-line six-cylinder engine, and the V-8 equipped gs 400. Both are mid-sized 4-door sedans whose declared mission is to upset the BMW-Mercedes applecart.


The inviting, easily accessible cabin has very comfortable seats upholstered in leather and equipped with power lumbar support. The driving position is very good, and the tilt- telescopic steering wheel retracts when the ignition key is removed to facilitate entry and exit. The driver’s-side seating memory (seat, mirrors and steering-column) can only be activated with the   transmission  in Park.

The rear bench can comfortably accommodate two adults, as long as they are not too tall — head room is tight.

The trunk is bigger than before but still just average in size, with a dual-level floor that adds nothing to practicality. The rear seat back does not fold and does not have a port to accommodate long objects.

Convenience and safety

The GS is impeccably fitted and finished but can get a bit noisy on rough pavement. Of the many storage compartments, the glove compartment is especially impressive; it houses a six-CD disc changer as well as a pollen filter.

Everything in the GS bears the stamp of quality. The various controls have a solid feel, and all are ergonomically perfect. Our one small complaint concerns the click of the turn signals, which is practically inaudible.

Comfort and convenience features include an excellent dual-zone climate system with separate driver- and passenger-side controls, and a powerful audio system.

The analog dashboard information is projected into deep dials. The projection is clear and easy to read, never tiring for the eyes.

Safety features include dual front and side air bags, anti-lock brakes, traction control, stability control, and lockable head restraints. Xenon headlamps turn night into day; other headlamps pale in comparison. The view to the rear is limited by the rear head restraints, spoiler and small window.

Engine and  transmission 

The silky-smooth engine is lively and progressive through most of the rev range, thanks to Lexus’s VVT-i (variable valve timing with intelligence) system. Acceleration, both standing and passing, is adequate but timid compared to the gs 400.

The six-cylinder engine is melodious, if not spirited. More work is required to make the accelerator more progressive and communicative, and to rid it of its artificial fee.

The  transmission  is normally very smooth, but it can be slow to downshift in quick stop-and-go driving or when slowing almost to a stop, then re-accelerating. Combined with the jerky accelerator, this can generate abrupt, annoying shifts, inconsistent with Lexus’s “Relentless pursuit of perfection”.


The GS 300 offers a very smooth ride, occasionally firm, never uncomfortable and perfectly compatible with its sport sedan status. The 300 has a very firm grip, a solid feel, and is agile and easy to handle on winding roads. When it detects a skid, the VSC (vehicle skid control) system applies the brakes selectively at one or more wheels while reducing engine power. Despite the feeling of safety, drivers should ignore the temptation to override the laws of physics.

Quick and precise, steering is a bit heavy at slow speed and should provide more road feedback. The brake pedal requires a firm foot to obtain full braking power.

The GS 300 is impeccably built underneath, an examination at the CAA-Quebec inspection showed.


Lexus classes its GS vehicles as luxury sport sedans. While the six-cylinder engine may not fully merit the “sport” label, the GS 300 is nonetheless a finely balanced car offering inspiring handling. Careful construction, quality materials and generous standard equipment are an added appeal in a vehicle built by a company recognized for the reliability of its products.

Start With a School Radio Station

My 15-year-old nephew asked me, “How and where to practice and develop one of the working skills during school time?” My first thought, at that moment, was “College radio station”.

At 16, I joined my college radio station and began my job as an editor for an online music program. From that day, I have become acquainted with terms such as noise, sound, broadcast, frequency and so on. Luckier than many people, with that job, I could earn money for my living, besides gaining very much experience and building up many good relationships which can support my current and future career. And with such experience, now, I can give advice to my nephew or any youth who wants to start a career and develop their skill, knowledge in working.

Well, let me think about what we need for a college radio station. If just listing out, we might think that it’s too simple and easy: a studio, or source of program, and the   transmission  lines. If you are beginners, don’t think you can do much and all but step by step. It was really difficult at that time when we began with various odd pieces of equipment. We started using the easiest means of  transmission  by broadcasting in the school canteen, in classes. And later, we added more ways to reach the audience. We concentrated on serving our school and at the same time extended to other colleges in the same area. Actually, the running of our school radio station was based on fund-raising and sponsorship money. Besides some necessary equipment such as Mini-discs, computers, recorders, we faced a bigger problem for a long time looking for an old, affordable multi-track mixer. We didn’t have the advanced and efficient equipment to support our work.

The first broadcasting show of ours was a two-hour program divided into 3 smaller sections. The first one was “Hello Morning” with 3 tiny bulletins of 3 to 5 minutes each. In these bulletins, we presented all good and happy news. The second section was “Music Dedication Program”. We compiled a few collections of music and one by one was presented everyday. The third one was “School loud speaker” during which we announced important events of the school for the following week. Day by day, the program was extended and the coverage of the program was enlarged.

We received more orders from many schools for radio storytellers, puppeteers, live music programs, music festivals, and etc. The students who worked in the radio station were really in situation in which we could practice and develop the skills of drawing up plans, solving problems, devising strategies and many more. Two years later, our radio station was presented with a big gift from a local station: a voice changer software and a music editor software. These advanced softwares helped us handle our job properly. Instead of needing many students to join in dubbing for a story or a drama, now, we just need two “technical operators” and two students to make the dubbing. The old weak multi-track mixer was “retired” and the music editor.

We learnt how to apply these efficient tools in work. Of course, we found them very useful and interesting. We could easily record, remix music, add sound and effects, change one voice into many others. These jobs used to require many people and much time . However, applying our computers and these softwares, we could do the job well with just 4 or 5 people.

We spent much time, thought and labor in this extra-curriculum job, but we loved it. We made school lessons more interesting and exciting. We created a different way for children to gain experience and helped them make a presentation in a new way. We made a radio program which was considered the “voice” of students, pupils in the school. We sent meaningful music messages to friends, teachers, and so on.

I join my current company, a provider of voice changer and music editor softwares, because of many reasons. One of these reasons is that I want to support many college radio stations. My friends who used to work with me in our school radio station are all having good jobs in professional.

We are very happy to give advice and guidelines to youth in starting a school radio station or a home music studio.

One of the first advices from me is that “Don’t wait until tomorrow what you can do today”. Seize any chance you have, start with your dream, step by step, and you can see a clearer road for your future.

Is Your Motorcycle Fully Protected?

Are you really sure your motorcycle is fully protected?

As, no doubt you know, the oil you use in your motorcycle lubricates the engine and the   transmission . If you do not keep close track and regularly change that oil you could be looking at a huge bill from the repair shop. Could be “just” an engine or “just” a  transmission  or both.

Clean oil is vital to engine performance and durability. Oil must lubricate, cool and clean the engine as it circulates and in order to remain effective, it must be filtered as it cycles.

What about the oil filter you use?

If you do use a long-life oil, does your filter last as long as the oil?

Some filters are only good for 3,000 miles. Some filters seem to be good for nothing. Some filters are good for as long as your oil will last. Is the filter available in CHROME? I know I like a lot of chrome on my bike, even if it is “just an oil filter”!

What is that filter made of?

The unique construction and full-synthetic media of AMSOIL Ea Motorcycle Oil Filters allow them to provide unmatched performance in motorcycles and other power sports equipment. EaOM Filters last longer, stop smaller dirt particles and offer less restriction than other filters. Ea Motorcycle Oil Filters provide filtering efficiency of 98.7 percent at 15 microns, outperforming the best cellulose/synthetic blend media on the market. And did I ask: Is your filter available in CHROME?

What are you protecting your paint with?

What is CNC?

CNC is the acronym of Computer Numeric Control and it is often associated with plasma cutting as in CNC plasma cutting. A plasma cutting unit that is controlled by CNC is controlled by a computer. There are two basic classes of controls, industrial PC-based control systems and hobbyist/artisan PC-based control systems. The industrial CNC systems, such as the ones produced by Hypertherm or Burny, are robust enough to stand up the harsh production environments. They have a touch screen that can be housed inside of a heat shield for additional protection. The industrial CNCs are very costly, but they come highly recommended for any application because they are not vulnerable to typical PC problems meaning they have very little down time. Due to the high cost you will not often find industrial scale CNCs in a hobbyist’s garage. The artisan and the hobbyist plasma cutter use standard PC-based controls with I/O cards for controlling the plasma systems and the drives. Since these are regular PCs they are prone to an array of computer problems, but none that cannot be fixed.

If you want to use a CNC for your plasma cutting there are some things you will need. You will need a table for the cutting to take place on. On each side of the table you must have a rail that the drives can use to move the plasma systems; we will call this the x-axis. A bridge or gantry must span the table and each end must rest on the rails. The plasma system must be attached to a rail on the bridge which will allow it to move back and forth; the y-axis. Industrial strength set ups us fabricated steel for the construction of the table, rails and bridge. On the other hand, extruded aluminum is used for the hobbyist and artisan CNC plasma cutter set ups. The difference is that the steel is more robust and will withstand constant use whereas the aluminum can only withstand occasional use. If building one of these machines sounds a little scary to you, there are lots of kits that you can buy or you have the option of buying ready built CNC plasma cutters.

If you cruise the web you will be able to find many videos showing CNC plasma cutters in action. It is not the easiest topic in the world to explain and I suggest you check out some videos if you have not seen a CNC plasma cutter before.