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810 articles found
Physics
Certain solids build up electric charge on their surfaces the moment they are pressed or stretched. This article covers how the piezoelectric effect works, the meaning behind its n
Social welfare
Time banking is a neighborhood service-exchange system in which people earn time credits for the hours they spend helping others and use those credits to get help when they need it
Earth science
Heat waves are occurring frequently around the world, and their intensity and frequency are steadily increasing. As a result, many people are experiencing health problems, and agri
Physics
Optics is a field of scientific research concerned with light and vision, exploring the properties of light and its interactions in depth. Light is an essential element of our ever
Film & media
Diegetic sound is sound whose source we accept as being inside the story world, like dialogue, footsteps, or a radio in the scene, while non-diegetic sound such as background music
Psychology
Psychologist Abraham Maslow divided basic human needs into five stages. This article introduces his hierarchy of needs, from physiological needs, safety, and belonging and love to
Economics
If you had a worn, crumpled bill and a crisp new one in your wallet, which would you hand over first? This article explains Gresham's Law, the idea that bad money drives out good:
Earth science
Algal blooms are an environmental problem we occasionally encounter in everyday life. This phenomenon, which gives rivers and lakes a green color in summer, affects us in various w
Food & nutrition
Mineral nutrients (minerals) are essential for maintaining human health, and consuming them in daily life is important. They support various functions in the body, particularly by
Education
Why did students tutored one-to-one outscore 98% of an ordinary class? This piece explains Bloom’s 2 sigma problem: the three teaching methods Bloom compared in 1984, what standard
Design
When you are walking down the street and see red lettering against a yellow background, a particular fast-food brand naturally comes to mind. When you see wording in a plain, restr
Information technology
The Two Generals’ Problem is a thought experiment showing that, over a channel where messages can be lost, two parties can never be completely certain they have agreed to act toget
