 
The connection has failed.
Did you know that we are able to block the cell phone signal with aluminum foil?
Hi!
My name is Vitor
And today we are going to make an electromagnetic shielding.
But first 
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Nowadays we live surrounded by electromagnetic waves
Electromagnetic what?
Calm down,
Electromagnetic waves are waves formed  by electrons and magnegtic things
Just like the magnets.
Different from sound, electromagnetic waves do not need a medium to travel.
And it´s because of them that we have radios, microwaves, x-ray
And today i am going to teach you
how to block some of those waves
Like you phone signal
Isaac can i please borrow your phone?
Thank You!
Now i am going to call from my phone to Isaac´s phone.
So you can check that everything is working fine.
Now we are going to need a piece of aluminum paper
Thank you Isaac!
What am I doing? It´s really simple
I am going to wrap Isaacs phone on the aluminum paper
Its is important to wrap it well
Now i am giong call the phone again so you can see what happens.
Did you see it? It didn´t complet the call.
Now i am going to wrap it while it calls
Check out what happens.
It´s ringing
The connection failed
Are you curious to know how it works?
To understand it, we are going to need the concept of positive and negative charges
From the "bending water" video, you can click here to watch it.
It is also worth watching our video about the atoms.
One thing that Carol didn´t mention on the bending water video
Is that equal charges move away and opposites come together.
knowing this, the scientist Michael Faraday created an experiment
He went into a metal cage and sat on a wooden chair inside it.
And then he released a very strong electrical charge in the cage
Just lika a lightning
And nothing happened to him
Because the lightning is made up of electrons
An as equal charges repel each other
The lightning can´t get inside the cage
Because there is a negative charge barrier around it
When the negative lightning arrives at the cage
The eletrons inside the cage say
"Look people, the negative lightning is coming, we are also negative, let´s run!"
And they run as far away as they can, and the further possible is inside the cage.
And that is why this barrier is formed.
But Vitor, the phone signal is not a lightning or we would fry everytime we spoke on the phone.
Of course it is not a ligthning Carol
But the signal is an electromagnetic wave
So our shield is going to work the same way.
The negative charges inside will block the signal from the phone.
But this shield need to be made of metal to work
Because on the metals, the eletrons are free to go anywhere they want
And this doens´t happens on other materials.
Stay curious and see you next time on 
TEC EM CASA
