At first, it seemed like a routine household problem. A homeowner began hearing strange scratching sounds coming from his attic—soft at first, then louder each night. When he finally climbed up to investigate, he spotted a large, dark mass clinging to a wooden beam. Its shape and texture immediately made him think of a hornets’ nest, a dangerous but not uncommon discovery in older homes. But as he got closer, his confidence vanished. What he believed was an insect nest was something far more alarming—and far more expensive. Instead of hornets, the man was staring at a massive colony of...
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