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The Philadelphia Federation of Teachers polled 6,325 union members last week.
The survey showed that more than 71% favored a hybrid return, with some classes in-person and some classes online, while 73% thought a staggered schedule with students going to school on alternating days would be best.
One wrote: "My classroom was 104 degrees for weeks last year during heat waves. How in the world am I going to wear a mask all day without fainting?"