Notes
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Why 2.2 is not enough Rounding a conversion one step too early is the most common bug in this category. A ten-degree rise is not fifty degrees Temperature is the one conversion with an offset, and the offset does not apply to differences. Choosing the resistor: LEDs, pull-ups and pull-downs Three of the most common resistors in any circuit, and three completely different ways of arriving at a value. Why BMI misreads tall people, short people and athletes The formula divides by height squared. Bodies scale closer to a cube, and the gap grows with height. The two rules every staircase obeys Twice the riser plus the tread lands near 630 mm, and every riser in a flight must match. Everything else follows. Building a nine-step scale from one brand colour Nine tints of one hue, and only two of them can carry body text on white. Knowing which two is the whole job. Resize first, compress second Dimensions are most of a file. Going from 3000 pixels wide to 1200 removes six sevenths of the data before the quality slider does anything. What a kilowatt-hour actually costs you A 3p-an-hour device left on constantly is £263 a year. The annual figure is the only one that changes decisions. The character limits that actually truncate Some limits reject your text, some silently cut it, and one of the most quoted is measured in pixels rather than characters. Sizing to the room, not the floor Heating, cooling and pool chemistry are all volume problems. Two rooms with the same footprint can need very different equipment. Why calculators disagree about minus two squared Some answer −4 and some answer 4. Both are following a rule, and the rules are different. Let it decide, then watch your own reaction The answer is not the useful part. What you feel in the second after it lands is.
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