Logistics
A Buffer Against Stockouts: Safety Stock
Why do warehouses hold more inventory than they expect to sell? This article explains what safety stock is and how it relates to the reorder point, how to calculate it from the ser
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Library & information science
The Family Tree of Research Papers: Citation Indexes
How do you find the studies that have cited a paper you are reading? This article explains how Eugene Garfield's citation index came about and what it is, how to search backward an
Robotics
Robots You Wear: Exoskeletons
What exactly is an exoskeleton, a robot you wear like clothing to add strength to your body? This article covers its history starting with Hardiman, the sensors and control that re
Design
The Bigger the Target, the Faster You Reach It: Fitts's Law
You have probably tried to tap a small close button on your phone screen and ended up tapping an unintended ad. By contrast, the large payment button at the bottom of the screen is
Education
Learning Without Being Taught: The Hidden Curriculum
The hidden curriculum is what students learn at school without anyone planning or teaching it. This guide explains what it means and where it came from, how it takes shape in the c
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
Economics
Bad Money Wins: Gresham's Law
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:
Business administration
Watching Changes Things: The Hawthorne Effect
Why does performance often jump right after a new management practice is introduced, only to slip back later? This article explains the Hawthorne effect: its definition and the ori
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:
Information technology
Adding More Makes It Later: Brooks's Law
Why does adding people to a late software project often make it even later? This article covers the origin of Brooks's Law and the illusion hidden in the man-month, why adding peop