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809 articles found
Design
Isotype is a method of showing statistics with rows of identical picture symbols, created in 1920s Vienna by Otto Neurath and his team. This article covers the Social and Economic
Physics
Total internal reflection happens when light traveling from a material with a higher refractive index toward a lower one hits the boundary beyond the critical angle and is reflecte
Physics
Entropy is a quantity that captures why nature flows in only one direction. This article covers its origin with Clausius, the Second Law of Thermodynamics, Boltzmann's probabilisti
Statistics
The coupon collector’s problem asks how many random draws it takes, on average, to collect every type at least once. Learn how the average is calculated, what the numbers look like
Economics
Price discrimination is the strategy of selling the same product or service at different prices to different groups of consumers. This article covers the concept, the first-, secon
Social welfare
The principle of less eligibility holds that people receiving public relief must live at a lower standard than the poorest workers who support themselves. This piece covers why the
Social welfare
An ecological map, or eco-map, is an assessment tool that places a family or person in a central circle and draws their ties to surrounding systems such as work, school, hospitals,
Tourism studies
Cultural tourism interpreters play an important role in helping people understand and enjoy tourist destinations and cultural heritage more deeply. By providing visitors with exten
Psychology
Have you ever heard things like "Aren't you being too sensitive?", "I'm saying all this for your own good, so why are you acting like that?", or "When did I ever do that? You must
Education
Learning is an essential process for the continuous growth and development of individuals and society. Improving the efficiency and effectiveness of learning requires a deep unders
Psychology
Why are some people so confident even when they do poorly on a test, while experts often seem modest? This article explains the Dunning-Kruger effect and the classic study behind i
Chemistry
A flame test identifies metal elements by the unique color of light they emit in a flame. This piece covers how the colors arise, Bunsen and Kirchhoff’s spectroscopy, fireworks, an
