Edition · Wednesday, 13 May 2026
What happened, the forces beneath it, why it matters — then your turn.
01 · Lesson · why it matters
Why PCOS Just Got Renamed After 90 Years
PCOS affects 10% of people who menstruate, but its name pointed doctors toward ovaries when the real problem was metabolic. The rename isn't symbolic—it reroutes where patients go and what treatment they get.
Read the lesson
02 · Lab · your turn
Compounding Error in Chains
A classification mistake at the start of a sequential process doesn't stay small—each step trusts the previous one, so a 20% error at the entry becomes a 59% error four steps later, making the first decision the highest-leverage point in any chain of dependent actions.
Rehearse the decision