jonathan hite joins us now. dr. jonathan, it's so great to have you on.' school doesn't allow phones. i'm surprised this isn't happening more across the country. it conflicts with studying and learning. >> one thing we know is that test scores in the united states were rising from the 1970s to about 2012 and then they started dropping. it wasn't caused by covid. they started dropping after 2012. the way you can understand it, imagine older people if you remember being in high school in the 1980s or '90s, imagine if they said you can bring your television into class, you can bring your vcr, talky talky, guitar, put it on your desk or whatever. that's what we've done. the smartphone has all these thinks and more so of course kids aren't paying attention in class. the tragic thing is, they're not paying attention to each other between classes or lunch. they're on their phones most of the time. >> i talked to a principal the other day of a school that banned smartphones in school and what struck him the most was remembering back to i guess about 20122, 2012,