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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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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.
Health
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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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.
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.
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.
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.
Sport news
Your Myers-Briggs type is four coin flips in a trench coat
The MBTI measures four real traits with decent reliability, then discards most of what it measured by drawing a line through the middle of a bell curve.
Breakfast is not the most important meal of the day
The randomised trials point gently the other way. But the real story is the audit that found only 17% of citations to a key trial described its results accurately.
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.
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.
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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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.
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Opposites don’t attract, but that was never the interesting question
115 of 118 partner traits correlate positively. The gap is in personality — and the twist is that none of it predicts whether a couple will be happy.
Your Myers-Briggs type is four coin flips in a trench coat
The MBTI measures four real traits with decent reliability, then discards most of what it measured by drawing a line through the middle of a bell curve.
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.