In this plain-text e-book, italic text is denoted by _underscores_. Superscripted text is indicated by a preceding caret mark, e.g. 2^{n-1} _Of all human ambitions an open mind eagerly expectant of new discoveries and ready to remold convictions in the light of added knowledge and dispelled ignorances and misapprehensions, is the noblest, the rarest and the most difficult to achieve._…
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