Lava people: Special thanks to Tom Pfeiffer, Giovanni Tomarchio, Etna Guides, in particular Rosario Basile (photo), Turi Carbonaro, Andrea Ercolani, Carmelo Ferlito, Alfio, Andrea and Nino Mazzaglia, to Finanza Guards, Etna Park Rangers and INGV volcanologists, in particular Boris Behncke, Sonia Calvari and Marco Neri.