(somewhat off-topic) - Lloyd: As a once conventionally trained natural scientist now (at least to a large extent) converted, perhaps I might comment that, presenting a paper at a conference on oil pollution and its biological impact, I referred to an assumption in one of my previous publications which I now knew to be incorrect. During the next coffee-break, numerous others appeared amazed that I had actually admitted a mistake publicly! So much for Popper! Tony N-S.
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