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The last article makes the most sense to me, complete random chance that the right ingredients were in the right rock at the right time.
The analogy "If you have a near infinite amount of scrabble tiles, no matter how many times you drop them, you probably are not going to get Hamlet's soliloquy." tends to be followed up by the analogy of not dropping the tiles at random, but instead placing them down so they best fit together (say in the sentence TO BE OR NOT TO BE, placing a T, then continuing until you got an O and so on) it would not be that difficult a task to form the soliloquy (I forget the exact number of tries, it is in the book “Darwin’s Dangerous Idea” if you want to look it up, it’s only a couple of thousand I believe). This same thing happens when chemicals best suited to be together will most likely stay together, and eventually over time form more complex proteins and possibly DNA.
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