The Pacific Ocean knows how to 'sneeze.' Every few years, warm water from the coast of Indonesia spreads toward South America, triggering floods in some regions and droughts in others. This phenomenon is called El Niño, or ENSO. The big question is: does it fade on its own, like a swing that slows down if you stop pushing? Or is there a motor inside that keeps spinning itself up?

Testing this is tricky. Scientists use a simple model that boils everything down to two numbers: how warm the water is and how thick the warm layer is. Based on these numbers, the model says whether the anomaly is growing or fading. And here's the odd part: it almost always says 'fading.' The authors of the new study decided to check whether the model itself might be lying. They ran a computer simulation where they knew the true answer, then applied the same method they use on real data.

Why is that? The model is too simple. It leaves out many details, and those omitted details get 'absorbed' into the parameters, skewing them. It's like looking at a pendulum through frosted glass: it will always seem to be damping down, even if a spring is driving it. So the conclusion that El Niño fades may be wrong. In reality, it might be self-sustaining. That matters because the system would then be more fragile and could shift behavior abruptly if the climate warms.