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Likewise: Do the scientists truly understand the DNA they're cutting and pasting?

I believe you're moving the bar. You asked if anyone could prove that life could be made from non-life. I gave you one example of how this might be done.

And what's to understand about DNA? It's a simple organic polymer. You know. Plastic.

[AndrewC]

And what's to understand about DNA? It's a simple organic polymer.

I find that akin to "What's to understand about Linux? It' a simple sequence of 1's and 0's."

Well, when you think it is that simple, you end up with billion dollar spacecraft crashing into the surface of Mars instead of gently landing there.