What's that sound? It may sound like a very loud buzzing or droning that lasts all day and into the night. But before you call the police to report what you think could be a siren, whine or roar, ...

An acoustics professor, a food critic and an audio producer are staring at their devices in a Peruvian restaurant in downtown Washington. “What are you getting?” “Let’s see … it’s fluctuating.” “I ...