blessing and was behind the sham arizona audit, is now suddenly calling it quits. and upending the traditional five day work week. one tech company now is going all in four days. why? ceo of that company is my guest. let's go out front. and good evening, i'm erin burnett. out front tonight, the standoff. 340,000 kids not in school today in chicago. waiting, again, to find out if they will get any sort of instruction in the nation's third largest school district after negotiating all day, dhik chick and the city's powerful teacher's union are still at a standstill. the mayor wants kids back at their desks, in person, in school. the union does not. and now, the white house is involved. the administration saying it's in touch with the governor of illinois and the mayor of chicago. but there is an answer that was actually put out there today. it's from one of the nation's most prominent children's hospitals. okay? this is it. this is it. this is guideent from the children's hospital of philadelphia. the doctor from the hospital telling cnn the recommendations