“Let me just ask you this,” says Rich, our Grand Canyon Field Institute guide, as we near the south rim. “Are you fundamentalist?” We squint, baffled. Nothing about us suggests piety – I’m clutching a strong coffee between two Connolly leather gloves and my fella Eliot is checking the Redskins game on his iPhone. Rich explains that he tries not to offend visitors whose beliefs might conflict with geologic science by, if necessary, editing out times and dates. “I cannot walk into your minds with dirty feet,” he says.
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