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809 articles found
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
Robotics
What determines how a robot can move? This article explains degrees of freedom, covering what the term means, how six-axis industrial robot arms work, the degrees of freedom of the
Food & nutrition
In modern society, rapidly changing lifestyles and irregular eating habits make it difficult for many people to maintain their health. In these circumstances, health foods are attr
Economics
The Phillips curve shows an inverse relationship between unemployment and the pace at which wages and prices rise. This article covers what Phillips found, how the curve was used i
General knowledge
Betteridge's law of headlines is the adage that any headline ending in a question mark can almost always be answered with a single word: no. This article covers how the law came ab
Information technology
Dennard scaling is the semiconductor scaling rule that if transistors are made smaller while voltage is lowered by the same ratio, the power used by a given area of a chip stays th
Information technology
Why is pressing an elevator button twice safe, while double-clicking a payment button feels risky? This article explains idempotence—from its mathematical name to everyday buttons,
Design
Every color we use in daily life has its own reasons and hidden psychology. This guide covers red, orange, yellow, green, blue, purple, brown, gray, white, and black, explaining th
Economics
The Producer Price Index (PPI) is an economic indicator and an important tool for measuring changes in the prices of goods and services that producers supply to the market. It does
Library & information science
Why are the papers on a subject concentrated in just a few journals? This article explains how Bradford's law came about, dividing journals into zones in the ratio 1 : n : n², its
Library & information science
Why do a small number of researchers write so many papers? This article covers the inverse square law Lotka identified in 1926, its uses in bibliometrics, and its limits, such as e
Statistics
Simpson's paradox is the phenomenon in which a relationship seen within separate groups weakens or even reverses when the groups are combined. This article covers its definition, w
