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The South African National Biodiversity Institute, which runs the zoo, denied it, saying it was behaviour learnt from years of circus life that would never be completely unlearned.

Perhaps the process can be reversed and an addiction unlearned.

This is learned behavior and can be unlearned.

They have unlearned how to do anything but hold each other for time, fatally unaware of how much the other fighter has left in the tank.

But what we’ve witnessed in these bank runs and collapses is a sign that the lessons of that historic event are still unlearned.