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Where the three-to-six-month emergency fund rule actually came from
The most repeated number in personal finance was set in 1996 by polling 156 advisers. Six million households of bank data suggest a very different answer.
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The four-day week trials mostly didn’t test a four-day week
The pilots cut about four hours a week, not eight. Iceland never ran one. And the best-instrumented trial found healthier workers, unchanged revenue, and a significantly faster pace of work.
Health
No health authority has ever recommended 10,000 steps
Every official physical activity guideline is written in minutes, not steps. A 1965 pedometer brand name filled the gap — and it is aimed at exactly the wrong people.
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The four-day week trials mostly didn’t test a four-day week
The pilots cut about four hours a week, not eight. Iceland never ran one. And the best-instrumented trial found healthier workers, unchanged revenue, and a significantly faster pace of work.
The Vitamin D Trials Nobody Talks About
Two of the largest supplement trials ever run found almost nothing. Then the Endocrine Society withdrew the threshold that made half the country deficient in the first place.
Stretching Barely Prevents Injuries. Strength Training Cuts Them by Two Thirds.
A meta-analysis of 26,000 participants ranked the injury-prevention strategies head to head. The one everybody does came last. The one almost nobody does came first, by a mile.
The 21-day habit rule came from a plastic surgeon’s book preface
Maxwell Maltz was describing how long patients took to get used to a new face. When researchers finally measured habit formation, the range ran from 18 days to 254.
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No health authority has ever recommended 10,000 steps
Every official physical activity guideline is written in minutes, not steps. A 1965 pedometer brand name filled the gap — and it is aimed at exactly the wrong people.
What ‘just go for a walk’ leaves out
The evidence on exercise and depression is weaker than the headlines and more interesting than the sceptics allow. It points at structure and supervision, not walks.
Nobody Is Left-Brained. The Man Who Won the Nobel for Split Brains Said So...
A study of 1,011 brains looked for people whose left or right hemisphere ran stronger overall. It found lateralised functions everywhere and lateralised people nowhere.
The eight-glasses rule is a sentence someone deleted
The 1945 document blamed for the rule said most of your water comes from food and that thirst is an adequate guide. Both sentences were cut. Here is what the evidence actually shows.
The sleep chart everyone copies has a footnote nobody reads
The age-by-age sleep chart is a compromise document, and the panels that wrote it said so. What the primary sources actually show about how much sleep you need.
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Learning Styles: The Experiment That Would Settle It Has Almost Never...
You are not a visual learner or an auditory learner. The claim has a precise testable form, a required study design, and a research literature that overwhelmingly endorses it without using that design.
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The Open Office Was Built on a Measurement. Then Nobody Measured It Again for...
When researchers finally put sensors on employees before and after a redesign, face-to-face interaction fell by about 70%. The study did not measure productivity — and after six decades of fit-outs, almost nothing has.
Nobody Is Left-Brained. The Man Who Won the Nobel for Split Brains Said So...
A study of 1,011 brains looked for people whose left or right hemisphere ran stronger overall. It found lateralised functions everywhere and lateralised people nowhere.
Learning Styles: The Experiment That Would Settle It Has Almost Never Been Run
You are not a visual learner or an auditory learner. The claim has a precise testable form, a required study design, and a research literature that overwhelmingly endorses it without using that design.