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janet yellen today appearing before congress. what she said about the safety of american banks. the u.s. threatening to ban tiktok over national security fears. how the popular app's owner is responding. the cross-country storm, tornado warnings and hail in texas. snow in the midwest, and caught on camera, the daring flood rescue in los angeles. nbc news investigates, why is this school still open near a plant the epa says emits a toxic chemical? families demanding answers. the first big upset in march madness. the tiny school pulling off a stunner in its first tournament app...

March madness is back and already has its shares of upsets and controversy. the alabama crimson tide advancing from the first round today all after the team's star player was linked to a deadly shooting. we get more from sam brock. >> reporter: the first two days of march madness are a basketball blitz. 32 games in 48 hours marked by last-second theatrics like furman pulling out this incredible steal and three-pointer to knock off virginia. >> furman has won! >> reporter: but this year there's a major headline off the court, brandon miller. >> the past three months the tide's on court success ...