A strange metal object of unknown origin was found in the inside of a geode - a natural mineral that as we know, requires millions of years to be formed. It is mostly unusual to find a piece of metal which is both polished and manufactured, inside a geode.
It's one of Dawkin's older books, but it seemed to stand the test of time to my uneducated eye. Helped me understand evolutionary theory much more clearly and the origin of life in general. Definitely recommend if you're looking to learn more on those subjects.