The ocean is a noisy place. Although we don’t hear much when we stick our heads underwater, the right instruments can reveal a symphony of sound. The noisemakers range from the low-frequency bass tones of a fish mating ritual to the roar of a motorboat. The study of how underwater animals hear is a growing topic in marine science, especially with regards to naval sonar and whales.

Azerbaijan may have the mega-energy revenues needed to build roads and to refashion its military, but when it comes to regional healthcare, the country’s attention appears to be focused elsewhere.

Like many rural Azerbaijanis, Intigam Mammadov, a resident of Imamgulubayli village in southern Azerbaijan’s Agdam district, feels shortchanged by the situation.