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Nitrogen narcosis

Nitrogen narcosis is a problem for underwater divers. It affects the brain and nervous system a lot like alcohol, but goes away when the diver rises to a shallower depth. It does not have lasting effects after the depth is reduced.

Pepper spray

Pepper spray is a spray used for self-defence, by spraying it into an attackers face. It makes eyes water and causes intense pain, sometimes even leading to temporary blindness. Pepper spray is an inflammatory agent. When someone is sprayed with ...

List of R-phrases

R8: Contact with combustible material may cause fire R42: May cause sensitisation by inhalation R66: Repeated exposure may cause skin dryness or cracking R5: Heating may cause an explosion R32: Contact with acids liberates very toxic gas R38: Irr ...

Residual-current device

A ground fault circuit interrupter, or Residual Current Device is a type of circuit breaker which shuts off electric power when it senses an imbalance between the outgoing and incoming current. The main purpose is to protect people from an electr ...

Roll cage

A roll cage is a specially designed protective frame built in the passenger compartment of a vehicle. Generally made of welded steel tubing, a roll cage is a safety feature in the event of a rollover or crash. Roll cages are used mainly in auto r ...

List of S-phrases

S25: Avoid contact with eyes S15: Keep away from heat S62: If swallowed, do not induce vomiting: seek medical advice immediately and show this container or label S47: Keep at temperature not exceeding. °C to be specified by the manufacturer S42: ...

Safety lamp

The first safety lamp was invented by William Reid Clanny. It used bellows and water to separate gasses. Later, two newer designs were invented. One newer design was the Geordie lamp, made by George Stephenson, and the other was the Davy lamp, ma ...

Smokey Bear

Smokey Bear is a mascot of the United States Forest Service. He was made to teach people that forest fires are dangerous and how people can prevent them. An advertising campaign featuring Smokey was started in 1944 with the slogan, "Smokey Says – ...

Stroller

A stroller or pram is a hand-pushed vehicle to carry babies and young infants. More general terms include child carrier, baby transport or baby carrier.

Tornado drill

A tornado drill is something people do to practice what they would do if there were a tornado. It is usually done in a building such as a school or office. It starts with a signal such as an alarm or a spoken message over an intercom. After they ...

Traffic cone

Traffic cones are cone-shaped markers, usually made from plastic, that are put on roads to temporarily redirect automobile traffic in a safe manner.

Camaloon

Camaloon is an e-commerce company based in Barcelona, Spain. Camaloon is best known for printing services for Corporate Gifts, custom products & promotional merchandise.

Envelope

An envelope is a form of packing. Envelopes are used for sending letters or documents using regular postal mail. Envelopes are usually made of paper or hardened paper. An envelope may be small enough to make you need to fold the paper going into ...

Paper clip

A paper clip is usually a thin wire in a shape that is wrapped in on itself. It is used to hold two or more pieces of paper together by pressure. Some other kinds of paper clips use two pieces. The type of wire paper clip that is usually used was ...

Scrapbook

A scrapbook is a book where people can keep pictures, newspapers articles, recipes, letters and similar things. It is often used to keep memorable things or a collection of things. It is also often used in the hobby of scrapbooking. Scrapbooking ...

Time

Time is the never-ending continued progress of existence and events. It happens in an apparently irreversible way from the past, through the present to the future. To measure time, we can use anything that repeats itself regularly. One example is ...

24-hour clock

The 24-hour clock is a way of telling the time in which the day runs from midnight to midnight and is divided into 24 hours, numbered from 0 to 24. It does not use a.m. or p.m. This system is also referred to as military time or as continental ti ...

Ab urbe condita

The phrase is Latin. It literally means from when the city was founded. The city talked about is the city of Rome. This way of measuring time was not used in Classical antiquity. The first to have used it was the historian Orosius, about 400 AD.

Absolute space and time

Absolute space and time are concepts used by Aristotle and by Newton. They are still used in classical mechanics. Even in Newtonian mechanics, the notion of inertial frame of reference is used. The concepts of space and time were separate before ...

Anno Domini

Anno Domini, shortened as AD or A.D., is used to refer to the years after the birth of Jesus. AD is also a shortening for Christian Era. Similarly, Before Christ, shortened as BC or B.C., is used in the English language to refer to all years befo ...

Big Rip

In physical cosmology, the Big Rip is a hypothetical cosmological model which describes the ultimate fate of the universe. According to this theory all the matter of the universe from stars and galaxies to atoms and subatomic particles, and even ...

Common Era

Common Era or Christian Era is a method used to identify a year. It means "a year in our time". It is the system for recording dates used almost everywhere around the world today: it is in common use. CE is an alternative to the AD, system used b ...

Deadline

A deadline is a time by which some task must be completed. Very often, it means a time limit that is set in place by an authority - for example, a teacher tells students that they must turn in their homework in by a certain time. This is so the t ...

Equinox

An equinox is when the sun passes directly over the equator. There are two equinoxes each year. Equinox can also mean either of the two days when this happens. On these days, the nights are equal in length at latitudes L° North and L° South. The ...

Kali Yuga

In Hinduism, Kali Yuga, is one of the four stages or yugas that the world goes through. Traditionally, most Hindus believe that the Kali Yuga is 432.000 years long. Kali Yuga is also recognized and stated in Sikhism, in the Guru Granth Sahib.

Lorentz transformation

The Lorentz transformations is a set of equations that describe a linear transformation between a stationary reference frame and a reference frame in constant velocity. The equations are given by: x ′ = x − v t 1 − v 2 c 2 {\displaystyle x={\frac ...

Metric time

Metric time is a way of measuring how long a period of time is using the metric system. The metric system uses the second as a main unit of time. There are periods of time that are based on the second but shorter. They are named with metric prefi ...

Past

The past is something that has already happened. If something has not happened yet, it is called the future. Professors and researchers that study the events of the past, and try to explain why these events happened are called history professors ...

Synchronization

Synchronization is the co-ordination of a set of events into a system that works according to time. For example, a conductor of an orchestra serves to keep the orchestra in time, or synchronized. Systems that operate with all their parts in synch ...

Time dilation

Gravitational time dilation is a physics concept about changes in the passage of time, caused by general relativity. A clock in outer space moves more quickly than a clock on Earth. Heavy things like planets create a gravitational field that slow ...

Time horizon

A time horizon is a future point in time when something must be "done" or will be "over". Either way, the matter will be closed when the time horizon is reached. Common time horizons people use are: end of calendar year and end of fiscal year. en ...

Time limit

A time limit is a time horizon that is imposed on everyone at once. It may be used to try to achieve fairness in some system of ethics. For instance, if poor people and rich people are debating something, a time limit may be imposed so that the r ...

Timeline

A timeline is a way of displaying a list of events in the order they happened. It may be in the form of a list or a graphic design. A graphic timeline typically shows a long bar labelled with dates and usually events. But it can be other layouts ...

Yuga

This article is about the Yugas in Hinduism. For the Indian meditation exercise, go to Yoga. Hindus believe that there are periods of time called yugas: Satya Yuga, Treta Yuga, Dvapara Yuga, and Kali Yuga. When Kali Yuga ends, a new Satya Yuga be ...

Transport

Transport, or transportation, is moving people or things from one place to another place. Transport can be divided into infrastructure, vehicles and operations. Infrastructure includes roads, railways, airports, canals and pipelines. The infrastr ...

BNSF Railway

The BNSF Railway Company is the biggest freight railroad network in North America. BNSF has 44.000 employees. They are one of ten Class I railroads. They have 32.500 miles of track in 28 states. They have more than 8.000 locomotives. It has three ...

Boat keel

On boats and ships, the keel extends below a boat along the central line. When a boat or ship is being built then the keel laying down is the first step and the date is noted as the start of the job. Only the launching of the ship more important.

Caravan (travellers)

A caravan is a group of people traveling together. Often they are on a trade expedition. Caravans were used mainly in desert areas and throughout the Silk Road. Traveling in groups aided in defense against bandits, in the same way that convoys at ...

Containerization

Containerization is a system of freight transport based on a range of steel containers. Containers are built to standardized sizes. They can be loaded and unloaded, stacked, transported over long distances. They can be transferred from one mode o ...

Convoy

A convoy is a group of vehicles, typically motor vehicles or ships, traveling together for mutual support and protection. Often, a convoy is organized with armed defensive support. Civilian convoys may be organized, for example when driving throu ...

Gas station

A gas station, also known as a filling station, fueling station, service station or petrol station is a facility which sells fuel and lubricants for motor vehicles. The most common fuels sold are gasoline or diesel fuel. The fuel is dispensed by ...

Hitchhiking

Hitchhiking is a way to end travel from place to place in someone elses car or lorry. Usually, a hitchhiker will stand at the side of a road and hold his or her thumb in the air waiting for a passerby to come and pick her or him up. This is a sig ...

Junction

A junction is any place where linear things, especially roads and railway tracks, meet. A Road junction is a place where roads meet. These are known as T junctions and X junctions.

Knuckle-walk

Knuckle-walk or knuckle-walking is a way some land animals move. Knuckle-walking animals curl fingers or front toes like a fist and touch the ground using the bony part of the front foot, the knuckle. Gorillas, chimpanzees, anteaters and platypus ...

Lawrence Transit

The Lawrence Transit System is the city public transportation agency in Lawrence, Kansas. It works together with the City of Lawrence and the University of Kansas. They have services from Monday through Saturday from 6 a.m. to 8 p.m. on most rout ...

Navigation

Navigation is the methods used to learn where someone is and how to go to another place. Since this is easy when landmarks are visible, the word is often limited to the methods ships or aircraft use. The word navigation was invented in the 15th c ...

Passenger

A passenger is a term that is used for a person who travels in a vehicle, but not the driver or a person working in the vehicle. There are two common ways in which the term is used: The first is for persons who ride in cars or vans. The term is u ...

Passenger name record

Passenger name record is the name for a set of data in a database, which contains the path a passenger travelling with one or more airlines takes. In some cases, groups of people travelling together are stored in the same passenger name record. P ...

PATH Transit

The PATH, known as Port Authority Transit is a 13.8 mile 22.2 kilometers rapid transit system in the northeastern New Jersey Cities of Newark, Harrison, Jersey City and Hoboken and Lower and Midtown Manhattan in New York City. It is operated as a ...

Pedestrian

A pedestrian is a person travelling on foot, whether walking or running. In modern times, the term mostly refers to someone walking on a road or footpath, but this was not the case historically.

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Pino - logical board game which is based on tactics and strategy. In general this is a remix of chess, checkers and corners. The game develops imagination, concentration, teaches how to solve tasks, plan their own actions and of course to think logically. It does not matter how much pieces you have, the main thing is how they are placement!

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