Keys Nina and the Neurons

# If you've got a question and you don't know where to go

# Ask Nina for some help Cos she's got a science show

# She makes sense of her senses While helping all her fans

# By doing her experiments with potions and with bangs

# Touch your tongue, tongue!

# Fingers, fingers!

# Eyes, eyes! Ears, ears! Nose, nose!

# Nina and the Neurons find out what you need to know

# Nina and the Neurons find out what you need to know

# Luke, he helps us with our eyes and Felix with our touch

# Ollie sniffs out smells And Belle, she hears so much

# Bud is Ollie's brother He helps us with our taste

# They're Nina's little neurons And they're coming to your place!

# Touch your tongue, tongue!

# Fingers, fingers!

# Eyes, eyes! Ears, ears! Nose, nose!

# Nina and the Neurons find out what you need to know

# Nina and the Neurons find out what you need to know

# Oh, yeah! #

Oh, hello!

This is my special notebook. It's got its very own padlock and key.

I write my favourite experiments here and know they're safe.

ALARM BEEPS

I hear a beep, I see a flash, I wonder what they're going to ask.

Hi, Nina!

Hi, guys!

We've got a question, how does a key open a lock?

That's a great question, how does a key open a lock?

A key's a useful invention as it means we can lock up

our precious things and keep them safe.

Come to my workshop and we'll check it out.

See you soon, Nina. Bye.

See you soon!

Well, I'm going to need some help to answer this one

and I know just who to ask. OK, Neurons, time to get to work.

Neurons at the ready, Nina.

OK, today's question is - how does a key open a lock?

Which Neuron do you think'll be most useful in helping us?

-Me!

-Me!

-Me!

Will it be fabulous Felix?

I can help so very much if you need the sense of touch.

Will it be beautiful Belle?

I send messages to brain from ear,

if there's a sound I'll help you hear.

Will it be lovely Luke?

For looking and seeing, day or night,

I'll help you with your sense of sight.

Will it be awesome Ollie?

If it's pongy or whiffy but you can't tell,

my messages help your sense of smell.

Or will it be baby Bud?

Sour, salty, bitter or sweet, I'm your taste buddy whenever you eat!

It's Belle!

-Yes!

-Go, Belle!

Go, Belle! Go, Belle! Go, Belle!

Go, Belle! Go, Belle! Go, Belle!

Brilliant! I'm all ears, Nina.

Today's question is - how does a key open a lock?

Belle will help us today as we use our sense of hearing to listen

for the click of the key turn in the lock.

But, Felix, I might need help from you later.

Felix is ready to feel and touch.

I need to get the workshop ready for the inventors.

Kye, Russell and Ella want to find out all about keys.

Small keys, chunky keys, jingly, jangly, dangly keys.

So today, for one day only,

Kye, Russell and Ella become The Inventors!

Hi, guys!

Hi, Nina!

Oh, come in, welcome to my workshop.

It's lovely to see you all.

Your question was - how does a key open a lock?

Why?

When we moved into our new house we had lots of keys.

But we didn't know which opened the right door.

It was a good game.

Well, in that case, I think we should try it out.

As you can see here, there are some boxes with locks on them.

They all have a different key.

So can you match up the key to the right lock?

I'm going to pass the keys along, that's great.

We don't know which key goes in which lock!

OK, guys. Ready, steady, go!

Oh, is it going to work?

Has anyone got...

Oh! Kye got one open!

Well done, so that's the right key with the lock there.

How we getting on over here? Oh, my goodness.

Yay! OK, so we've got two keys.

Yay!

That means this one should open as well. What a good job, guys.

If you hear a click as you turn the key, you've opened the lock.

That's why you need your hearing neuron.

So we now know that a key opens and closes a lock.

But, how does it do it?

We need to get inside for a closer look!

Now here's a much bigger lock.

And if I turn it round...

..that's what the inside of a lock looks like.

Here's the hole, where the key goes through.

And there's the bolt.

Now can you see all those lines round there, yeah?

Those are called grooves.

Have a look at this key here.

It's got lots of corners and jaggy bits.

Yeah, and you see those sticky out bits in the middle?

Those are called teeth.

Let's see what happens when we put this key inside the lock.

If you look really closely,

you can see that the little teeth on the key fit perfectly

with the grooves, so it allows us to turn the key right round.

And we can open it.

Isn't that fab?

But you know, this lock is actually pretty small.

I know something much bigger that uses the same science.

-Would you like to go and see another invention in action?!

-Yes!

-Let's go!

Oh, I wonder where we're going today.

I LOVE seeing the big inventions.

What uses the same science as a lock and key?

I'm not really sure, Belle.

Well, I think we're about to find out, guys!

This is a door into a bank vault.

Now a vault is a very secure room with big, thick walls.

Why does the door have two key holes, Nina?

Normally, two people have a key each and they both need to open it.

What's the big wheel for?

Oh, this wheel has a very important job, in fact in order to show you,

I think we need to open the door.

Oh!

THEY GASP

Look at all that treasure!

Oh, and look at these. Oh, these bolts look just like the bolts

we saw on the lock in my workshop.

Only they're much bigger and because they're so big and heavy

the only way to move them is by turning this wheel.

So why don't you have a go?

Oh, brilliant! Well done, and can you put them back in?

And you can only turn the wheel

when both of the keys are being used to unlock the door.

We know lots about locks now,

so I think we should try to create our own lock.

Come on, Inventors, let's go back to the workshop.

Oh, better lock this first.

Locks and keys are very useful for keeping things safe.

But who invented them?

Listen to me, everyone, I can tell you.

Well, people have been trying to lock things away for a long, long time.

In fact, the first ever lock was invented by the Egyptians

over 4,000 years ago!

They were so worried about all the precious things

they put into the pyramids that they invented the first ever lock.

And nobody could enter the pyramids without a key. Perfect!

We've seen some huge locks and keys at the bank vault

but we should answer your question - how does a key open a lock?

We've found out that there's a special pattern of teeth on a key

and inside a lock there's also a special pattern.

Why doesn't every key work on every lock?

Great question!

We need to get inventing to find out!

So the first thing we're going to do is cut out our shapes.

So, off we go!

Staying in the line, very good.

Be very careful with scissors, they can be very sharp.

There we go. Now what we're going to do

is to stick our shapes onto the cardboard.

Make sure you're happy that it's nice and straight.

Stick some glue on there.

Oh, excellent.

OK, now we're going to cut these out.

To make the door handles, gently pop through, there we go.

That's beautiful, and then give it a wee squeeze.

Very good. That's it.

Now we need to make the actual handle which will be some string.

So, if you face the door up the way,

then take the other end of the string and pop it through there.

Turn it over and just tie a knot,

so that the door handle won't fall off.

Now that really does look fiddly.

Absolutely perfect!

So now we need to stick the door in place.

So I take a couple of pieces of sticky tape

and we're going to make it like a hinge so just down one side.

Down the straight side of the door.

And stick it like that.

Now we need to fix the key wheel in position.

And take one.

And separate them. Now be careful cos they're a bit pointy at the end.

Now I think, Inventors, we are ready to try our lock.

OK, so take your door handle,

and try and open the door.

Oh!

Oh, no, that's funny - the door's not opening.

It's because the teeth and the key don't match.

Oh, let me just try moving the key wheel round to there.

Do you think it'll match now?

No.

OK.

How about if I move it right round to there?

Yes!

Hey! The key finally fits the lock.

So, the door won't open unless the shape of the key wheel lines up

completely with the shape of the door.

Keys work in the same way. Each key and each lock

has a different pattern and they have to fit together exactly

so the key can turn and the door can open.

OK, so your question was - how does a key open a lock?

I think we've answered it. We looked inside a lock

and found there's a special pattern of grooves

on a round piece of metal called the tumbler.

And there's also a special pattern on a key called the teeth.

When you use the correct key and lock, the patterns should fit

together exactly so you can turn the key and open or close the door.

That's how a lock works. Thank you for coming to my workshop.

Thanks, Nina. Bye!

Bye! See you soon!

If you want to make today's invention,

visit the Nina section on the CBeebies website.

That'll give you all the instructions you need.

Or, you may have other ideas of what you want to invent.

-Bikes!

-Trains!

-Binoculars!

-Televisions!

-Speakers!

-And cars!

# We all love inventing!

# Woah-oh-oh-oh-oh! Go inventing!

# We all love inventing

# Why don't you try it too?

# Inventions make life easier

# And help us get things done!

# Go inventing!

# I always like to take a look

# At how they work and run!

# Go inventing!

# We all love inventing

# Woah-oh-oh-oh-oh! Go inventing!

# We all love inventing

# Why don't you try it too? #

I've had a brilliant day.

I loved hearing the click sound of all those keys turning.

It's been a marvellous day.

It was fascinating when Nina looked inside the lock.

I've had a fabby day!

I loved seeing that big door of the bank vault.

It was the heaviest door I've ever seen!

I really enjoyed myself today.

I thought the lock Nina and the Inventors made was fantastic.

Our day's been bursting with inventions.

I hope you've enjoyed it.

-See you again soon, bye!

-Bye!