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drugs. tough, new auto emission standards about to be announced, but will they push more americans to go electric a big upside of artificial intelligence, detecting cancer much earlier, and predicting when it might strike and the young, bold athletes sharing their culture and superstar tony hawk. >> announcer: this is "nbc nightly news" with lester holt >> welcome. once again, in the tragic aftermath of a mass shooting, we're getting a person look at pol risking their own lives to stop an active shooter late this afternoon, louisville police releasing body cam video of officers...

to underscore how today could have been radically different in modern history books as we watch what is happening today. what we understand is in a benchmark of progress, 24 hostages have now been released. 13 israelis, 10 thai nationals and one filipino citizen as the israel-hamas hostage deal holds steady on the first of what will be a longnd critical four days. among the youngest israelis freed today, a 2-year-old, 4-year-old, 5-year-old and a 9-year-old. you can see a small child here getting into that bus preparing to go home and leaving their nearly seven-week long nightmare be...