In my book I classify scientific presentations according to the following scheme:

a)  speaker has no goal apparently
b)  speaker wants to prove he is smarter
than anybody in the audience
c)  speaker wants to give listeners a flavor
of new developments in his field
d)  speaker wants to teach some new
science to the listeners.

In the book I discuss talks of type a), b) and d) to some length, but I say noting about talks of type c). The basic reason being that talks of this type are very difficult to deliver.

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