So without further ado, it is a great personal privilege and a high honour to introduce our Scientist-in-Chief, the President of the United States, Barack Obama.

　　Thank you. Thank you. As humans, we can identify galaxies light years away. We can study particles smaller than atom. But we still haven't unlocked the mystery of the three pounds of matter that sits between our ears.

　　We are, to all intents and purposes, our minds. They, more than anything else, define the kind of person we are. Yet, as Barack Obama recently observed while launching a 100-million-dollar brain initiative, our inner spaces are also almost impenetrable. Fantastic progress has been made using techniques like MRI scans to analyse the working brain. But some specialists think that this top-down analytical approach to the brain can only get you so far in neuroscience. Taking a lead from engineering, they believe there's much more to be learned by tinkering, by making - the synthetic approach to the brain, the subject of this edition of Discovery.

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（编辑：杨帆）