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“Wool is very strong, too, but — bugs. We have to be careful,” he says. “The moth problem is getting worse every year here in Belgium. I think it’s due to the climate change, I don’t know. We had some very warm summers.” Above, one of several bug traps posted around the sensitive historical racks; luckily, Mertens reports, it hadn't caught anything. WIth fur, the curators don't take any chances — it's stored in its own special room.