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But as a crisis often does, this one has exposed existing inequalities — among schools, among districts and among students. Just over half of the nation's public school children are from families considered low-income, and an estimated 12 million lack broadband Internet access at home.

Robin Nelson, an educator with 10 years experience, says one of the students in her class has special needs and needs significant accommodation, and the family also struggles financially. "I've spoken to his mom. There's another little one on the way, if not already arrived."

And, Nelson notes, for that family and many like it, "survival is a priority and not, you know, accommodations right now for him." Nelson thinks the student may end up repeating a grade. She's also concerned about children whose parents must go out to work, and who are sending their kids to home-based daycares that remain open.

She tears up talking about her "babies" and how much she misses greeting them at the door with a fist-bump, handshake or hug. Sadie Hernandez wrote a note and drew pictures to leave on her beloved teacher's doorstep.

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