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809 articles found
Food & nutrition
The Atwater general factor system estimates a food’s energy by multiplying each nutrient by a fixed value, such as 4kcal per gram for carbohydrate and protein and 9kcal per gram fo
Statistics
Why does the share of heads get closer to half the more times you toss a coin? This article explains the meaning and principle of the law of large numbers, its history beginning wi
General knowledge
Cardiopulmonary resuscitation (CPR) is a basic first aid technique for saving the life of someone in cardiac arrest. This technique temporarily replaces the functions of the heart
Earth science
Fog is a weather phenomenon frequently encountered in everyday life and an important factor that limits visibility and greatly affects transportation safety. In particular, fog can
Information technology
Wirth’s Law is the rule of thumb that software gets slower faster than hardware gets faster. This piece covers where it came from, why software keeps getting heavier, examples arou
General knowledge
Chesterton’s Fence is the principle that you shouldn’t remove a rule or custom until you understand why it exists. This piece covers its origin in G. K. Chesterton’s 1929 essay, th
Library & information science
Berrypicking, named by Marcia J. Bates in 1989, is a model of search in which queries and interests evolve and useful information is gathered bit by bit—unlike classical retrieval
Business administration
Kaizen is a management approach in which everyone on the front line keeps making small improvements instead of one grand change. This article covers what the word means and where i
Earth science
Why can one side of a mountain range be cool and damp while the other is hot and dry? This article explains the foehn effect: how air changes temperature as it rises and descends o
General knowledge
A look at the concept and types of units, how they are used across everyday life and the sciences, and practical examples of converting between units of length, weight, time, tempe
Economics
The Big Mac Index compares the price of a Big Mac around the world to gauge whether a currency is overvalued or undervalued. This article covers how it began, the purchasing power
Robotics
Unimate, installed at a General Motors plant in New Jersey in 1961, is regarded as the world’s first industrial robot. Learn how it grew from George Devol’s patent, how its hydraul
