you have to challenge yourself to rethink

what you consider impossible.

The expression "like talking to a wall"

means that the person you're talking to

can't or won't listen because walls can't listen.

Or can they?

It's exactly this kind of accepted wisdom

that we love debunking.

If you have ingenuity and determination,

then really nothing's impossible.

We're going to be conducting our experiment

at the Berlin Wall Memorial.

It's the only section where both sides

of the wall are still standing

with no man's land in between.

To get the wall to listen, we're going to use

something called an accelerometer.

We normally use these accelerometers

to pick up microscopic vibrations

inside machines like turbines and jet engines.

They help us diagnose potential problems

before they arise so that we can prevent

power outages and flight delays.

We're going to attach an accelerometer

to one side of the wall.

If we're right, it should be sensitive enough

to detect the tiny vibrations produced

by a person talking on the other side.

We'll be filtering the signal,

and then playing it through speakers

to a group of kids on the far side.

So, in a way, the kids will be listening

to what the wall is hearing.

We won't have someone just talking to a wall,

he'll be reading a whole storybook.

Let's see if it works.

- The Cat's Tale.

The Cat's Tale.

In a land far away but also quite near,

there were two groups of cats.

Oh didn't you hear?

Did I say they were the same?

No, Not quite.

There was one difference although very slight.

For now let me tell you just how it will end.

(wall muffles the speaker)

And lived forever in peace just as they ought to.

(everyone claps)