The California Academy of Sciences in San Francisco is being billed as the world's greenest museum. The complex houses an aquarium, a planetarium and a natural history museum. We visit a museum of a different kind in Italy, which shows how Roman cities were destroyed by eruptions of Mt. Vesuvius. We go where there is very light pollution at night so the wonders of the night sky are visible to an amazing degree. Also, we visit an annual mobile phone conference in Barcelona.