Brooke Borel says bedbugs were essentially wiped out after World War II thanks to DDT. It's not totally clear why they came back in the past couple of decades. iStockphoto hide caption

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Bedbugs are becoming a common nuisance in many places. But cheap ultrasonic devices advertised as bedbug repellents don't work, scientists say. Carolyn Kaster/AP hide caption

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Often times, bed bug infestations stem from a succession of inbreeding from one female's progeny. Orkin, LLC/PR NEWSWIRE hide caption

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