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ابزارهای یادگیری هوش مصنوعی را باز کنید
ثبتنام کنید تا به ابزارهای قدرتمندی دسترسی پیدا کنید که به شما کمک میکنند سریعتر از هر ویدیو یاد بگیرید.
How To See Germs Spread Experiment (Coronavirus)
آمار یادگیری
سطح CEFR
سختی
زیرنویسها (252 بخشها)
- I've always thought if we could somehow
just see the germs around us,
everyone will be a lot more careful
and we'd get sick way less.
Unfortunately, that's still not possible.
So I did the next best thing
by running a daylong experiment
in this third-grade classroom.
I found this powder called Glo Germ.
And just like real germs, when it's on your hands,
you can't see it.
But unlike real germs,
if you turn a black light on, it becomes visible.
But it transfers to things you've touched,
so it provides a really good way
to visualize exactly how germs spread.
So before the kids arrived, as a control,
I went around and noted any preexisting spots
in the room that fluoresced under the black light.
And then it was go time.
The kids, of course, had no idea what we were doing
and that the teacher had been secretly infected
with the glowing powder.
So she randomly shook the hands of three kids
but didn't touch any of the rest.
And so with that, they just went about their normal day.
(lighthearted music)
At break, I did choose one random student,
and he agreed to letting me put some of the powder
on his hands too.
And then two hours later at lunchtime,
I checked the results.
Remember, everything you see here started
with just the teacher
and one student having a little of that powder
on their hands.
And because my flashlight can only illuminate one spot
at a time,
I used Photoshop to better visualize our observations
of where germs were left behind,
including on the other kids.
Uh-oh! (children exclaiming)
We're pretty hot over here!
Oh, right here.
And they were actually pretty diligent
about washing their hands.
This was the desk of the kid that was infected.
And what's crazy is that germs could live
on a hard surface like this for up to nine days.
And so you can see how important it is
to disinfect the things a sick person regularly touches.
زیرنویس کامل در پخشکننده ویدیو موجود است
با تمرینها یاد بگیرید
تمرینهای واژگان، گرامر و درک مطلب از این ویدیو بسازید
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