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spec: As stated in previous articles , one thing to be very clear about is that nobody except a very small number of Google engineers can claim to know the exact variables Google uses to populate its ranking algorithms . For example , forms for assessing the risks associated with the use of chemicals , biological agents , radiation etc .. The first was the Eleatic , whom we shall mention hereafter ; the second was this man of whom we are now speaking ; the third was a Rhodian , who wrote a history of his country in one book ; the fourth was a historian who wrote an account of the expedition of Pyrrhus into Italy and Sicily ; and also an epitome of the transactions between the Romans and Carthaginians ; the fifth was a disciple of Chrysippus , who wrote very few books , but who left a great number of disciples ; the sixth was a physician of Hesophila , a very shrewd man in intellect , but a very indifferent writer ; the [ 273 > ] seventh was a grammarian , who , besides other writings , has left some epigrams behind him ; the eighth was a Sidonian by descent , a philosopher of the Epicurean school , a deep thinker , and very clear writer . Sixth is the search for the perfect family , the kind one has not yet experienced .