Presentation is one of the important skills which a researcher should have and a graduate student should keep learning and practicing. Presentations are often made for discussing research ideas or results on research meetings or conferences. A good presentation certainly helps much to delivering the ideas to the audience.
Scientific presentations have some differences with other kinds of presentations, sharing some common rules. I find a very good lecture from iBioSeminars by [[https://med.stanford.edu/profiles/susan-mcconnell|Dr. Susan McConnell]]. Dr. McConnel gives helpful advice on preparing and presenting an effective scientific talk and presentation including choosing fonts, colors and slide styles, ways to structure the talk and more.
The lecture: [[http://www.fclose.com/t/go/susan-mcconnel-presentation/|Susan McConnell: Designing effective scientific presentations]]. It is also available on [[http://www.youtube.com/ibioseminars#p/search/3/Hp7Id3Yb9XQ|YouTube]].
The website also provides the [[http://media.hhmi.org/ibio/mcconnell/mcconnell_powerpoint_pt1.pdf|Slides]] and [[http://media.hhmi.org/ibio/mcconnell/mcconnell.mp4|MP4 format video]] and more to download.