From butterflies to wind turbines, project preserves world's sonic heritage / 10 butterflies that are stunning natural beauties / US lost a fifth of its butterflies within two decades / Over the last 25 years, 20 percent of America's butterflies have vanished. Will they soon be gone? / 'I hope there are plenty of butterflies for you to watch': Bibas father pays tribute to sons and wife at funeral / Small Ohio River town embraces butterflies to symbolize change, recovery / Butterflies at wedding moved bride to tears. Soon strangers were weeping too. / Facial recognition linked to close social bonds, not social butterflies / I raise delicate butterflies on the mean streets of New York / Butterfly exhibit takes flight at MOSI