As easy as getting blood from a stone

Martill, D.
February 1992
New Scientist;2/22/92, Vol. 133 Issue 1809, p19
Reports that paleontologist Phil Wilby of the Open University in Great Britain has identified blood cells in fossil fish 100 million years old. Where the fossil blood came from; Calcium phosphate began to replace the tissue of the fish only moments after the fish died, a process called the Medusa effect.


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