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Making effective slides

How to avoid death By PowerPoint

Only one message per slide and use a dark background

not to divert attention from the audience

so as

You have to use contrast and size to focus. Only 6 objects per slide

anything over 6 would require drastic cognitive energy from your audience to process

because

Avoid displaying text and speaking at the same time

the audience does not forget what you say and what is shown in the PowerPoint

so that