Prayer. Bombs. Walls. Over the decades, people have tried all of them to stanch the flow of lava from Hawaii's volcanoes as it lumbered toward roads, homes and infrastructure.
Now Mauna Loa — the world's largest active volcano — is erupting again, and lava is slowly approaching a major thoroughfare connecting the Big Island's east and west sides. And once more, people are asking if anything can be done to stop or divert the flow.
