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investigation. severe storms, more than 30 million under the threat of a potential tornado outbreak, and heavy flooding from texas to west virginia. we're ting it president biden and canadian prime minister justin trude anncing a major immigration deal. will it stem te record surge of migrants at america's northern border? taking the stand at a utah trial. the man suing the actress over a skiing accident. and our series, "ai revolution," the rapidly developing technology that can literally read your mind. >> announcer: this is "nbc nightly news" with lester holt. good evening...

and wounded five u.s. troops at a base in northeast syria. our reporting, the key radar system that was down at the time. did that leave the base open to attack? also tonight, the scare at the office of the manhattan d.a. investigating donald trump. the suspicious powder and threatening letter discovered. police hauling hazmat bags from the building. it comes as mr. trump warns of death and destruction if he's charged for a hush money payment and a new blow for mr. trump and the special counsel's january 6th investigation. severe storms, more than 30 million under the threat of a...

Brain, then the ai will read that out of my brain? >> yes, yes, that is exactly right. >> reporter: scientists pursued this for years but ai makes the difference. here's a giraffe shown to a subject. ready? here's the image the ai created, and it is sometimes very different between people. here's the original image of a grassy field, now here's three different versions generated from three different people's brain activity. now, what you're seeing is a recording of previous scans, not a realtime demonstration, and this process is slow. it requires an expensive machine, and it has to be individ...

And the current system doesn't do that. we cannot -- we have to transition to give doctors more of -- we're going to say, look, we're going to look at how well you keep these patients healthy, how much you keep them out of the hospital. and that, i think, is the key transition that we have to make in this country. and it's not going to -- it's not something you can do overnight. but there are many parts of the affordable care act that incentivize that change and frankly, there are things we can do more. >> we're talking a lot of different things here. mike barnicle and then dr. sachs. >> i wan...