books.google.com.au - The astonishing biography of a mineral that can sustain our world- or destroy it Uranium occurs naturally in the earth's crust-yet holds the power to end all life on the planet. This is its fundamental paradox, and its story is a fascinating window into the valor, greed, genius, and folly of humanity....http://books.google.com.au/books/about/Uranium.html?id=XM67WMGwugYC&q=percent&utm_source=gb-gplus-shareUranium
