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809 articles found
Economics
Comparative advantage is the principle that each party gains by specializing in what it can produce at a lower opportunity cost than others. This article covers the basic concept,
Economics
Global and domestic bond markets have undergone many changes recently. A bond is a financial product that serves as a form of IOU issued by governments, companies, financial instit
Social welfare
The Charity Organization Society (COS) was a private organization founded in London in 1869 to coordinate scattered charities so that help was neither duplicated nor missed. This a
Tourism studies
Why do residents' smiles toward tourists turn into sighs as tourism grows? This article covers the background of Doxey's Irritation Index, its four stages of euphoria, apathy, anno
Statistics
In many naturally occurring sets of numbers, smaller leading digits appear far more often: about 30.1% start with 1, and only about 4.6% with 9. This article explains the definitio
Film & media
Rack focus shifts the sharp subject within a single shot by changing the lens focus, guiding the viewer's eye without a cut. This article covers how it works, what it says in a sto
Chemistry
Why does salted cabbage release its water overnight? This article covers what osmosis is, the three factors that drive it, everyday examples, and reverse osmosis, the technology th
Physics
The Foucault Pendulum is a device that shows the Earth's rotation with your own eyes: a heavy bob on a very long wire whose plane of swing slowly turns relative to the ground. We l
Economics
The law of diminishing marginal utility describes how the extra satisfaction from getting one more of something keeps shrinking. We look at what marginal utility means, how the ide
Chemistry
A colloid is a mixture in which particles too small to see are evenly dispersed and suspended in another substance. This article explains how colloids differ from solutions, the co
Robotics
Grey Walter’s Tortoises were small robots built in the late 1940s by British neurophysiologist William Grey Walter that explored their surroundings on their own using just two vacu
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
