evidence that life started ~4.1 million years ago

Originally posted by humy
OK, that was a lame joke I think.
But, on the subject of abiogenesis, we can, from the fact that all modern life that we have analyze the codon language so far has the same codon language, deduce that at least most modern life must have originated from the same abiogenesis event. But that doesn't rule out the possibility that many other abiogenesis events occu ...[text shortened]... uld have come from a different abiogenesis event. Has anyone looked to check its codon language?

It looks like the jig is up on arsenicy bacteria:

http://www.nature.com/news/arsenic-life-bacterium-prefers-phosphorus-after-all-1.11520