India, May 1 -- The fundamental lesson of any tragedy that claims to teach something is simple: build a mechanism that prevents repetition. Yet history rarely behaves like a controlled experiment. It loops, mutates, and returns in altered form, often in places that insist they have already understood the lesson.

Forty years ago, on a day like today, 26 April, Chernobyl tore through that assumption. It did not just expose a failed reactor design; it exposed how quickly institutions, states, and expertise bend under pressure, secrecy, and denial. Since then, new nations have formed, old ones have dissolved, and international bodies have rebranded themselves as guardians of "lessons learned". And still, the core pattern persists: systems th...