The ambition behind it far exceeds the two- or four- or even six-year terms of any politician. Here we were trying to build a structure that would last longer than the Great Pyramids of Egypt, longer than any man-made structure, longer than any language. When forced to adopt a long view of human existence—when looking back on today from 10,000 years into the future—it’s hard not to view Yucca Mountain in near-mythical terms. We can imagine future earthlings pondering it the way we ponder the Parthenon or Stonehenge today—massive structures imbued with an alien spirituality. ... Ten thousand years may be the time scale of legends, but nuclear waste storage is a very real and practical problem for humans. It is a problem where incomprehensibly long time scales clash with human ones, where grand visions run up against forces utterly mundane and petty.