Invisibility

Invisibility is the state of an object that cannot be seen. An object in this state is said to be invisible (literally, "not visible"). The term is often used in fantasy/science fiction, where objects cannot be seen by magical or technological means; however, its effects can also be demonstrated in the real world, particularly in physics and perceptual psychology classes.

Since objects can be seen by light in the visible spectrum from a source reflecting off their surfaces and hitting the viewer's eye, the most natural form of invisibility (whether real or fictional) is an object that neither reflects nor absorbs light (that is, it allows light to pass through it). This is known as transparency, and is seen in many naturally occurring materials (although no naturally occurring material is 100% transparent).

Invisibility perception depends on several optical and visual factors. For example, invisibility depends on the eyes of the observer and/or the instruments used. Thus an object can be classified as "invisible to" a person, animal, instrument, etc. In research on sensorial perception it has been shown that invisibility is perceived in cycles.

School

A school is an institution designed for the teaching of students (or "pupils") under the direction of teachers. Most countries have systems of formal education, which is commonly compulsory. In these systems, students progress through a series of schools. The names for these schools vary by country (discussed in the Regional section below) but generally include primary school for young children and secondary school for teenagers who have completed primary education. An institution where higher education is taught, is commonly called a university college or university.

In addition to these core schools, students in a given country may also attend schools before and after primary and secondary education. Kindergarten or pre-school provide some schooling to very young children (typically ages 3–5). University, vocational school, college or seminary may be available after secondary school. A school may also be dedicated to one particular field, such as a school of economics or a school of dance. Alternative schools may provide nontraditional curriculum and methods.

Counter-Strike: Global Offensive

Counter-Strike: Global Offensive (CS:GO) is an online first-person shooter developed by Hidden Path Entertainment and Valve Corporation. It is the fourth game in the main Counter-Strike franchise. Counter-Strike: Global Offensive was released for Microsoft Windows, OS X, Xbox 360, and PlayStation 3 on August 21, 2012. The Linux version was released in September 2014. It features classic content, such as revamped versions of classic maps, as well as brand new maps, characters and game modes. Cross-platform multiplayer was planned between Windows, OS X, Linux, and PlayStation 3 players, but was ultimately limited to Windows, OS X, and Linux because of the differences in update-frequency between systems. The PlayStation 3 version offers three input control methods, which include using either the DualShock 3 controller, PlayStation Move or USB keyboard/mouse.

Gameplay

Like the previous games in the series, Global Offensive is an objective-based multiplayer first-person shooter. Each player joins either the Terrorist or Counter-Terrorist team and attempts to complete objectives or eliminate the enemy team. The game operates in short rounds that end when all players on one side are dead or a team's objective is completed. For most game modes, once a player dies, they must wait until the round ends to respawn.

High school

A high school (also secondary school, senior school, secondary college) is a school that provides adolescents with part or all of their secondary education. It may come after primary school or middle school and be followed by higher education or vocational training.

Terminology

The term "high school" originated in Scotland, with the world's oldest high school being Edinburgh's Royal High School from 1505. The Royal High School was used as a model for the first public high school in the United States, Boston Latin School founded in Boston, Massachusetts.

The precise stage of schooling provided by a high school differs from country to country, and may vary within the same jurisdiction. In all of New Zealand and Malaysia, along with most of Britain and parts of Australia, Bangladesh and Canada, high school means the same thing as secondary school, but instead of starting in 9th grade, these "secondary schools" begin at ages 11 or 12.

Country by country

Australia

In Australia, high school is a secondary school, from Year 7 or Year 8 through to Year 12, varying from state to state. High school immediately follows primary (elementary) school; therefore, a Year-7 Australian high-school student is sometimes as young as 12. In Tasmania and the Australian Capital Territory, the term "high school" generally refers to Years 7–10, whereas the term "College" is used for Years 11–12. In Victoria the term "secondary college" has largely replaced the term "high school" following the reforms of the Labor Government in the late 1980s and early 1990s. Some schools have retained the name "high school" (such as Melbourne High School) and many have now dropped the "secondary" and are simply known as "college".