It is a lecture by Garr Reynolds(Authors@google) about presentation.He has very clearly described the elements needed for a good presentation and has also suggested what We should do for making Presentation understandable and likeable.
48. Summary:1.Keep slide simple
2.Make it concrete
3.If data is important handover written material
4.Put some humor and emotion
5.Work on design
6.Start working on paper then move to PC
7.Use Images
8.Use Audio or Video
9.Keep empty spaces
10.Tell a story
11.Give time on Preparation and Rehearsal
12.Animate your audience not your slide
13.Keep lights on
14.Use remote control
15.Do something Unexpected
16..Move away from podium
17.Try to connect with people
18.Be yourself, confident and excited
19.Organize a question answer session.
20.Put summary at last