From TED Talks: The Official TED Guide To Public Speaking by Chris Anderson :-
The house lights dim. A woman, her palms sweating, her legs trembling just a little, steps out onto the stage. A spotlight hits her face, and 1200 pairs of eyes lock onto hers. The audience senses her nervousness. There is palpable tension in the room. She clears her throat and starts to speak.
What happens next is astounding.
The 1200 brains inside the heads of 1200 independent individuals start to behave very strangely. They begin to sync up. A magic spell woven by the woman washes over each person. They gasp together. Laugh together. Weep together. And as they do so, something else happens. Rich, neurologically encoded patterned of information inside the woman’s brain are somehow copied and transferred to the 1200 brains in the audience. These patterns will remain in those brains for the rest of their lives, potentially impacting their behaviour years into the future.
The woman on the stage is weaving wonder, not witchcraft. But her skills are as potent as any sorcery.
Ants shape each other’s behaviour by exchanging chemicals. We do it by standing in front of each other, peering into each other’s eyes, waving our hands and emitting strange sounds from our mouths. Human-to-human communication is a true wonder of the world. We do it unconsciously everyday. And it reaches its most intense form on the public stage.
The campfires or old have spawned a new kind of fire. A fire that spreads from mind to mind, screen to screen: the ignition of ideas whose time has come. From the first time our ancestors teamed up to take down a mammoth to Neil Armstrong’s first step onto the moon, people have turned spoken words into astonishing shared achievements.
We need that now more than ever. Ideas that could solve our toughest problems often remain invisible because the brilliant people in whose minds they reside lack the confidence or the know- how to share those ideas effectively. That is a tragedy. At a time when the right idea presented the right way can ripple across the world at the speed of light, spawning copies of itself in millions of minds, there’s huge benefit to figuring out how best to set it on its way, both for you, and for the rest of the world who need to know what you have to say.