Ongoing research around the RBCT culling sites also shows that while the benefits of culling within the trial zone persist for some time, the spike in infections around the edges - the perturbation effect - tends to dissipate over time.

BBC: Badgers back in the firing line

With the young age of the population at that time (the US was still an emerging market, ) and additional culling of the population by World War II, not many people tapped into the social security system.

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