Short answer: The presenter does not think about what the audience needs to hear to understand him/her. Unfortunately this is an extremely difficult skill to master - requiring one to step into the shoes of someone in the audience. But that's not even the main problem.....
Some old ones Reposted...
8/18/13 - A Classification of PI's - find yours' in the list!
7/6/12 - Way to a "Science paper"
5/30/11 - 20/20 Hindsights
9/30/11 - Evolution of a bizzare, new Idea
11/17/2011 - Rationale for curiosty-driven research...
lessons from a 4 year old
1/28/12 - "GTFM" - hilarious article on grant writing!
The PI Blog
This blog exists because my wife seemed a bit tired of being the only recipient of my random pontifications on life and Science for many years; and gently encouraged me to vent in a blog instead. From time to time, I put down thoughts that occur to me as I naiively stumble through a life in Science - bestowed upon me by accident (literally!). Please keep in mind that these musings are rather obvious things of little or no use to anyone, and are certainly not personally targeted in any way, even though they are obviously derived from my experiences. OK, enough said.