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\title{Seven year units in science: general lessons from the personal
experience of working on adrenal cortex innervation and cortisol
secretion}



\author[1]{Bruce Charlton}%
\affil[1]{School of Psychology, Newcastle University, Newcastle upon Tyne NE1 7RU, England}%


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  \date{May 07, 2026}


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\begin{abstract}
It seems to me that the learning and practice of science naturally falls
into approximately seven year units; and indeed the same could be said
about `life'. (Note: My operational definition of `seven' is `more than
five but less than ten'.)~ My academic life has certainly been
consistent with this idea; and here I describe the first seven year unit
of my work as an active scientist: this was the seven years I spent as a
laboratory researcher focused primarily on the adrenal cortex. This unit
was successful; in the sense that I solved, to my own satisfaction, the
problem I was working-on. There may be some general interest and
instruction to be derived from taking this specific example as a
generalisable account of the different phases and aspects of an arc of
science -- how a line of research may be initiated, developed and
brought to a conclusion. Furthermore, it is suggested that other
scientists might (if it comes naturally to them) consider changing their
focus and developing new interests every seven years or so.%
\end{abstract}%



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