In complex vertebrates, including humans, the amygdalae perform primary roles in the formation and storage of memories associated with emotional events.

Memories of emotional experiences imprinted in reactions of synapses in the lateral nuclei elicit fear behavior through connections with the central nucleus of the amygdalae and the bed nuclei of the stria terminalis (BNST). The central nuclei are involved in the genesis of many fear responses, including freezing (immobility), tachycardia (rapid heartbeat), increased respiration, and stress-hormone release. Damage to the amygdalae impairs both the acquisition and expression of Pavlovian fear conditioning, a form of classical conditioning of emotional responses.

My goodness, we're going to hit 70 percent penetration of cellphones in the developing world by the end of 2013. Think about it, that a Masai warrior on a cellphone in the middle of Kenya has better mobile comm than President Reagan did 25 years ago. And if they're on a smartphone on Google, they've got access to more knowledge and information than President Clinton did 15 years ago. They're living in a world of information and communication abundance that no one could have ever predicted. Better than that, the things that you and I spent tens and hundreds of thousands of dollars for -- GPS, HD video and still images, libraries of books and music, medical diagnostic technology -- are now literally dematerializing and demonetizing into your cellphone.

Ladies and gentlemen, what gives me tremendous confidence in the future is the fact that we are now more empowered as individuals to take on the grand challenges of this planet. We have the tools with this exponential technology. We have the passion of the DIY innovator. We have the capital of the techno-philanthropist. And we have three billion new minds coming online to work with us to solve the grand challenges, to do that which we must do. We are living into extraordinary decades ahead.