Is life even older than we thought?

The palaeontology of the earliest signs of life is a blend of chemistry and mineralogy. Uncertainty is part of life for people dealing with the most ancient evidence. Geologists are communally convinced that they have solid signs of life which are ~4.2 billion years old, but some samples seem to suggest an even earlier date.

http://news.bbc.co.uk/1/hi/sci/tech/7483451.stm

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