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Christopher Wills:
THE SPARK OF LIFE (Perseus, 2000)

(Copyright © 2000 Piero Scaruffi | Legal restrictions - Termini d'uso )
Since Miller first simulated the birth of life in a laboratory, the problem has been to account for the fact that those elements could be produced in one location rather than spread in an ocean. The chances of the right elements getting together in the same place at the same time is minuscule. Wills and Bada show how a beach could have provided the "filtering" process needed to get the aminoacids together. Tides washing ashore provide a natural filter because a beach is layers of chemicals that react differently with whatever is washed ashore. In particular, organic elements would tend to pile up in the same layer.
Wills and Bada also analyze the findings from the Murchison meteorite that fell in 1969 in Australia (it includes organic matter than is very similar to Miller's elements).

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