The 1960s don't seem that long ago to many of us. Given how crowded and closely connected the world of the present is, it's hard to imagine there were places then that had been settled and cultivated for four hundred years but, as recently as the 1980's, had no electricity, no plumbing, and very little traffic except for horses, donkeys, and (mostly bare) feet. The valley of the Rio Mira in Ecuador was such a place. Jesuit priests brought slaves...