Take a system like our planet, give it a constant input of energy from something like the sun, and the complexity of the molecules will slowly but steadily increase over billions of years. Life, or something akin to it, is virtually inevitable.
It's the idea that's been slowly but surely catching steam over the years. I'm guessing he did more than what was glossed over in the article and had some kind of mathematical proof of concept? As they seemed to be alluding to something like that.
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That monster in the mirror, he just might be you. -Grover