Thinking in kinds rather than cases is one of the oldest unresolved tensions in scientific practice — and William of Ockham, the 14th-century logician whose razor everyone quotes without reading, spotted something in it that most working scientists never quite confront. Ockham argued that the world contains only particulars: individual experiments, individual specimens, individual data points. Categories like 'mammal' or 'inflammatory response' are tools we construct, not natural joints we discover. The problem is that science runs on categories, and once a category is functioning smoothly — once you're fluent in 'cell stress' or 'market correction' — it begins to feel like a description rather than a decision. That invisible slide from convenient grouping to assumed reality is what the Indian Nyāya philosophers called 'jāti-dōṣa' — the error of misplaced universals, where a class-concept starts doing explanatory work it was never designed to carry. The practical consequence: the categories you use most fluently are the ones worth stress-testing, because fluency hides the seams. Specifically, pick one term you used in the last week to classify a result. Ask what it would mean for that classification to be wrong — not the data, but the grouping itself.

Pick one category you used this week to organize results or observations. What two things does it group together that might actually behave differently — and what would you have to change if you split them apart?

Drawing from Medieval Nominalism / Indian Nyāya Philosophy — William of Ockham (Summa Logicae, c. 1323) in dialogue with Nyāya doctrine of jāti-dōṣa (Nyāya Sūtras, c. 2nd century CE)