in the winter. it's one easy and natural way, they say, that can circulate fresh air. new york city is opening its schools despite protests from the teachers and principals union. at ps-532, principal kevin bowles says they'll be ready. what keeps you up at night? >> obviously, i take the safety of everybody in my community really seriously and in spite of my confidence in this plan, there is, of course, the reality that this is a scary and unknown virus. >> reporter: new york state has seen a covid-19 infection rate below 1% for the tenth straight day. but in california, they're still seeing an increasing rate of positivity and a rise in cases. public schools in los angeles going all remote for now and officials announcing a plan to regularly test all students and staff, as well as for family members of those who test positive or have symptoms. the program costing the second-largest school district in the country nearly $240 million.