Six Earth Cities That Will Provide Blueprints for Martian Settlers

If humans land on Mars by 2037 as NASA hopes, they'll need cities modeled on ones that already exist in extreme climates on Earth. Here are six high-tech (and a few low-tech) cities that would have a passing shot at survival in the Martian climate. Of course there are the obvious choices, like research stations in… » 3/28/08 3:30pm 3/28/08 3:30pm