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Europe. and you'll remember, biden's basically been preparing for this moment for decades. he spent 36 years in the senate where he circled the globe and also as vice president, but now he's coming to europe as the leader of the united states. the one who has the final decision-making power as he is trying to assert to allies that america has their back and to adversaries that america is ready to confront them. >> all right. arlette saenz, thank you so much as the president there at joint base andrews getting ready to head off for this very important trip. his first trip heading to europe wher...

To hazardous, which i guess is not great. so i started logging everything i did in my bedroom, so hopefully i could explain some of those spikes in the air quality reading. and then it was time to start the experiment. for my first high—tech intervention, i just opened the window for 2h hours to see whether luften really would make a big difference. and here are the air quality results. now what's cool about this is that all the dust spikes match up exactly with the log i was keeping. so you can see the air quality improved overnight. the dust levels went down. you can see exactly when i wok...

In the moderate zone with a few spikes all the way up to hazardous, which i guess is not great. so i started logging everything i did in my bedroom, so hopefully i could explain some of those spikes in the air quality reading. and then it was time to start the experiment. for my first high—tech intervention, i just opened the window for 2h hours to see whether luften really would make a big difference. and here are the air quality results. now what's cool about this is that all the dust spikes match up exactly with the log i was keeping. so you can see the air quality improved overnight. the...

What was surprising here was that the air quality results actually looked a bit worse with the window open for 2h hours. i don't know if that was just because there was a breeze coming in and so the dust was kept agitated and floating around for longer. it's hard to say, but if you look at the next day's readings with the window closed and no other interventions, overall, the dust spikes were lower. anyway with that out of the way, it was time for some tech. the first filter i tried was the tcl breeva. i wanted to include a low—cost device so this one doesn't have an auto mode and doesn't ha...

Kindergartners alone who just never logged on. let's talk to this teacher who likened his job the last year as being part of the fbi. >> a lot of the kids just went dark, and that's where our wellness laws and contact information came into play at. we had to actually -- sometimes you have to physically drive to the student's house. we keep our window open for kids, to parents. we're always making adjustments just to bring the kids up to speed. because i see it's going to be a challenge getting back into the swing of things. r, but i believe that we can do it. >> reporter: so what now? we spoke...