Stimulants are drugs that relieve mild depression, increase energy and activity, and include cocaine (coke, snow, crack), amphetamines (Desoxyn, Dexedrine), phenmetrazine (Preludin), methylphenidate (Ritalin), and others (Cylert, Sanorex, Tenuate).
Infant mortality rate: The number of deaths to infants under one year old in a given year per l,000 live births occurring in the same year.
International disputes: This category includes a wide variety of situations that range from traditional bilateral boundary disputes to unilateral claims of one sort or another. Information regarding disputes over international boundaries and maritime boundaries has been reviewed by the Department of State. References to other situations involving borders or frontiers may also be included, such as resource disputes, geopolitical questions, or irredentist issues. However, inclusion does not necessarily constitute official acceptance or recognition by the US Government.
Irrigated land: The figure refers to the land area that is artificially supplied with water.
Land use: Human use of the land surface is categorized as arable land—land cultivated for crops that are replanted after each harvest (wheat, maize, rice); permanent crops—land cultivated for crops that are not replanted after each harvest (citrus, coffee, rubber); meadows and pastures—land permanently used for herbaceous forage crops; forest and woodland—under dense or open stands of trees; and other—any land type not specifically mentioned above (urban areas, roads, desert).
Leaders: The chief of state is the titular leader of the country who represents the state at official and ceremonial functions but is not involved with the day- to-day activities of the government. The head of government is the administrative leader who manages the day-to-day activities of the government. In the UK, the monarch is the chief of state, and the Prime Minister is the head of government. In the US, the President is both the chief of state and the head of government.
Life expectancy at birth: The average number of years to be lived by a group of people all born in the same year, if mortality at each age remains constant in the future.
Literacy: There are no universal definitions and standards of literacy. Unless otherwise noted, all rates are based on the most common definition—the ability to read and write at a specified age. Detailing the standards that individual countries use to assess the ability to read and write is beyond the scope of this publication.
Maritime claims: The proximity of neighboring states may prevent some national claims from being extended the full distance.
Merchant marine: All ships engaged in the carriage of goods. All commercial vessels (as opposed to all nonmilitary ships), which excludes tugs, fishing vessels, offshore oil rigs, etc.; also, a grouping of merchant ships by nationality or register.