"Though, probably, no competent geologist would contend that the European classification of strata is applicable to the globe as a whole; yet most, if not all geologists, write as though it were so."

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The three most effective incentives to human action may be ... classified as creed, greed and dread. ... In examining the scientist it is perhaps worth while to examine how far he is moved by these three incentives. I think that, rather peculiarly and rather exceptionally, he is very little moved by dread. ... He is in fact essentially a person who has been taught he must be fearless in his dealing with facts.

— Robert Watson-Watt