Presentation skills are the difference between a speech and an essay. When I’m reading an essay, I can put in any emphasis I want.
Consider this poem.
To sit in solemn silence in a dull, dark dock,
In a pestilential prison, with a life-long lock,
Awaiting the sensation of a short, sharp shock,
From a cheap and chippy chopper on a big black block!
Read it out loud with a deep voice, taking your time with each word.
Now do it again in a sharp, high-pitched, scared voice.
One voice is the executioner and the other is the prisoner. Which one do you think is which?