Physics
The Real Reason the Sky Is Blue: Rayleigh Scattering
Rayleigh scattering, worked out by Lord Rayleigh in 1871, is the scattering of light by particles much smaller than its wavelength, such as air molecules, and it is far stronger fo
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Chemistry
A Different Color for Every Element: The Flame Test
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
Earth science
Why Cities Run Hotter: The Urban Heat Island
An urban heat island is when a city runs warmer than the countryside around it. This piece covers Luke Howard’s early records in London, why pavement and buildings trap heat, how t
Information technology
Even If It’s Not in the Docs, Someone Depends on It: Hyrum’s Law
Hyrum’s Law says that with enough users of an interface, every observable behavior will be depended on, regardless of what the documentation promises. This piece covers Hyrum Wrigh
Film & media
When Shape Carries Across the Cut: The Match Cut
A bone becomes a satellite, a match becomes a desert sun—what is that edit? This article explains the match cut: how it differs from a jump cut, graphic, action, and auditory types
Earth science
An Invisible Lid Over the Sky: Temperature Inversion
Why does a layer of air form that gets warmer, not colder, with height? This article explains how temperature inversions form and their types, their effects on fine dust, fog, and
Earth science
When the Ground Flows Like Water: Soil Liquefaction
Why does solid ground turn soft and flow like water during an earthquake? This article explains soil liquefaction, in which water-saturated sandy ground behaves like a liquid, cove
Food & nutrition
The Secret of Foods That Don't Spoil: Water Activity
Why doesn't honey spoil easily even though it contains water? This article explains water activity, a measure of the free water in food, and how it is measured, the limits below wh
Tourism studies
Even Tourist Destinations Grow Old: The Tourism Area Life Cycle
Why does a once-crowded beach resort end up with faded signs and empty hotels, while an unknown quiet village suddenly becomes famous? This article explains the Tourism Area Life C
Chemistry
Same Element, Different Faces: Allotropes
How can pencil lead and a diamond ring be made of exactly the same carbon? This article explains allotropes: what they are and how they arise, the many faces of carbon, examples fr
Statistics
Failures Stay Invisible: Survivorship Bias
Why do conclusions drawn only from what survived so often mislead us? This article explains survivorship bias: what it is and how it arises, the story of the World War II bombers,
Earth science
The Rhythm of the Ice Ages: Milankovitch Cycles
Why has Earth swung back and forth between glacial and interglacial periods? This article explains the Milankovitch cycles, the slow but regular changes in Earth's orbit and axis: