There are several ways of marking the stages in a scientist's life:centre dot as a young student one is invited to present one's ideas to ones colse associates. centre dot as an older student one is allowed (after extensive vetting) to present a 10 minute "contributed" paper to a society meeting centre dot as one's work is recognized meeting organizers invite one to give a 30 minute presentation of important work centre dot in due course as one becomes the world expert in a field one is invited to give a "keynote" speech at the start of a conference or a summary or "rapporteur" talk at the end. centre dot after that life goes downhill.Eventually,all one can do is give an after dinner talk
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