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...careful to note that in r-3=3/4 the numeral is a cardinal, not an ordinal, and that the expression means ‘the three parts’ and was not construed, as with ourselves, as meaning ‘three fourths’. In ordinary arithmetic the only complementary fraction used was 2/3. Compare in English ‘two parts full’, i.e. two-thirds full, doubtless a survival of the old Egyptian...

...adult tissues, cell death usually balances cell division, ensuring that tissues and organs retain the same size and structure as old cells are replaced. Apoptosis is a normal response in cells with DNA damage, serving to protect the body from cancer. * B cells One of two main types of lymphocyte (cf. T cells) which, when activated, synthesises and releases huge quantities...