What is the 10-20-30 Rule for PowerPoint? (Six Minutes) - Guy Kawasaki framed his 10-20-30 Rule for PowerPoint as:

• 10 slides are the optimal number to use for a presentation.
  
• 20 minutes is the longest amount of time you should speak.
  
• 30 point font is the smallest font size you should use on your slides.
  

How to Use the Rule of Three in Your Speeches (Six Minutes)

How to Speak: 7 Speaking Tips from Patrick Henry Winston (Six Minutes) - Each year, MIT professor Patrick Henry Winston delivers an open lecture entitled How to Speak. Positive word of mouth spread over the years, and the event now draws a beyond capacity crowd with people sitting uncomfortably on steps and the floor to listen to Winston.