Most listeners to these programs will at sometime have visited a museum to see the dinosaurs. Of course, the tangible remains consist of fossil skeletons and, if one is allowed to touch the bones, they are as hard as rock. Sometimes they are actually cement or plaster since they are copies. However, we are told that over the millions of years, the original bone had been replaced by minerals. Except for the millions of years, this is often true but not always. Fence posts, for example, have been found mineralized at one end and plain wood at the other.

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