The GG Network blog — page 3
Free lessons that leave you a little sharper every visit — plus deep guides to the professional tools. Knowledge shouldn't sit behind a paywall.
"45 days from now" and "60 days before the 20th" are the same calculation in opposite directions — here's the method, plus the one habit (forgetting leap days) that throws it off.
A timesheet is just a subtraction with a break taken out — except when the shift crosses midnight, which is where most hand calculations quietly go wrong.
The shelf life of expressed milk depends on where it's stored and when the clock actually started — which isn't always when you pumped. Here are the CDC limits, worked through by hand.
The body that sets US nutrition guidelines publishes an Adequate Intake by life stage — and explicitly refuses to give a per-person ounce formula. Here's the official number, split out by hand, next to the popular rule it doesn't endorse.
Every portable or window AC listing leads with a BTU number. Here's the rule of thumb behind it, worked by hand, and where to add a safety margin.
Every comfortable staircase is built around one number: a riser height close to 7.5 inches. Here's how that single target turns a total rise into a step count, an exact riser height, and a run length — worked by hand.
Ovulation tracking apps all run the same back-of-the-envelope rule: count back 14 days from your next expected period. Here's the arithmetic, with a worked example.
The Widmark-style formula behind most free BAC calculators is just three numbers and a subtraction. Worth understanding exactly because it is far too crude to make a driving decision on.
Bunching four workouts into Monday-to-Thursday leaves three rest days stacked at the end. One simple rule spaces any number of days across a week as evenly as seven days allow.
"Drink eight glasses a day" ignores that a 60 kg adult and a 100 kg adult don't need the same amount. A single per-kilogram multiplier gets you a number scaled to you.
Waking mid-cycle is what makes mornings feel rough, not the total hours slept. Count backward in 90-minute blocks from your alarm and you can pick a bedtime that lands you at the end of one instead.
A CPU spec, a radio dial and a spinning hard drive all measure frequency, but in units separated by factors of a thousand — or by a completely different unit, RPM, that still reduces to the same hertz.