From Bryn Glover, Kirkby Malzeard, North Yorkshire, UK
I have often mused on the origins of viruses and their mention in “Life’s big bang” has simply added to my confusion (8 August, p 34). The article says that viruses “can’t have come first”. So when did they arise, simultaneously or later?
If the latter, does this support the idea of some sort of second wave event in which a form of life separately emerged? And are such processes still occurring?
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