Tracking Twain into a Volcano

It’s lunchtime at Volcano House inside Hawai‘i Volcanoes National Park. Sitting in a rocking chair, I gaze out a wall of plate glass windows at Halema`uma`u. Two miles across the rocky landscape, lava erupts from a hole in the ground 4,000-feet above sea level. I have to remind myself of that. That below me an…