Rob writes:
It's not spontaneous as they've told you. It's spontaneous only after intelligent engineers manipulate the clay and introduce nucleobases and other components that cannot be accounted for in the clays themselves.
Maybe you're misunderstanding the word "spontaneous". As used by chemists, it means that the reaction will proceed by itself if all the materials are there and the conditions are right.
It doesn't matter whether the materials were placed there intelligently or stupidly. It doesn't require anybody in a lab coat to nudge the molecules together with tweezers.
It's just a matter of the right things being together in the right place at the right time.
“Faith moves mountains, but only knowledge moves them to the right place” -- Joseph Goebbels
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