Language originates as brain signals -- mysterious lines of squiggles -- that somehow turn into speech. Meet the neuroscientist who is turning those squiggles into conversations, using artificial intelligence to translate brain activity into words and sentences. Dr. Edward Chang of UCSF talks with Dr. Stieg about the painstaking "magic" of decoding that has allowed a paralyzed man to speak after 20 years of aphasia, essentially live streaming signals from his brain and transforming them into language.

Plus - Why are A.I. voices always female?

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