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

itoggle caption Carolyn Kaster/AP

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

itoggle caption Orkin, LLC/PR NEWSWIRE