THE HAMBURGER
the ratios of the mince and the five steps that decide the result
CAST IRON SKILLET
seasoning in 6 steps and everyday care — after the official Lodge instructions
FIRST FINGER FOODS
the size, the softness and the shape of a piece for a baby who feeds themselves, by the NHS guidance
NEAPOLITAN PIZZA DOUGH
four ingredients in the proportions written into an EU regulation
POUND CAKE
four equal weights — a recipe whose name is its ratio
SOURDOUGH BREAD
the timeline, hydration and grams — per King Arthur Baking’s Naturally Leavened Sourdough Bread
TABLE SERVICE
which side each thing arrives from, in what order the table is served, and what the hand may touch
BARBELL MATHS
the IWF colour code and the plate count: from target weight to each side of the bar, no calculator
THE CLOCK FACE
two hands, twelve numbers — how to read the time
DIVISIBILITY TESTS
what to read in a written number instead of dividing it: the tail, the digit sum and composite divisors
THE DOOMSDAY RULE
the weekday of any date in the Gregorian calendar, worked out in the head in three steps
THE RULE OF 72
the time it takes steady growth to double: the division you can do in your head, how far it misses and why the divisor is what it is