Dr. STONE (Dr.STONE)

I think it must have been about eight years

since we were petrified again.

I can't keep up with counting off all the seconds like Senku,

but still I want to stay awake for them.

Because I know Senku

Taiju

and the rest of them will be here as soon they can.

They'll come to revive us.

I'm 10 billion percent sure.

This boat rules.

It won't be long before we're back in Corn City.

Right you are. It's so fast.

And they'll be glad to see us.

Perhaps you should have paid more attention in your science classes.

I suggest you clean out those ears, Mr. Technician.

A voice has been screaming at us from the heavens this entire time.

So why did all you folks come back here?

Look.

OK, here's what's going on.

Senku and Xeno decided to work together to build a spaceship.

But just as they were really getting started on it,

Why-man sent us this creepy message asking if we want to die.

It's freaky, but it's not like I'm really scared of him or anything.

That said, we decided we should take the spaceship

up to the moon and stop Why-man before he petrifies everyone again.

I had hoped to share a toast with my fellow technicians.

Is Kaseki somewhere nearby?

He's still back with Senku and his team in India.

India?

I assume they're working on some big project there?

Yep, they are.

Just try not to freak out when I tell you what it is.

Yeah, we're gonna be making a computer.

Say what?

We won't freak out too much.

The Kingdom of Science's azy-cray crafting projects have really come a long way.

I mean, I remember when making a single light bulb was a big deal.

That's impossible!

Problem, Sai?

I was under the impression you had a burning desire for a computer.

Am I wrong?

Well, yeah. I mean, I do, but how's that even possible?

Good point.

How exactly would one go about manufacturing an actual computer in the stone world?

Seems trickier than previous crafts.

Computers aren't all that complex.

A switch is either on or off.

On equals 1 and off equals 0.

So that means we find a way to indicate and recognize ones and zeros,

and we're in arm's reach of our computer.

Yeah, whether it's the side of a playing card

or a flag being held up or down.

You can really make a computer by raising a flag?

I'm feeling lost here, Senku.

The guys' white flags represent numbers.

I think I see.

Up is 1 and down is 0.

And the ladies' red flags represent the answer.

Suika, the only thing you need to do

is to watch them and raise your red flag if the guys' flags are in opposite positions from each other.

Pretty simple, actually.

So what am I supposed to be doing here?

And what's the deal with my flag?

It's a little bigger than theirs.

When both white flags are raised,

that'll be your cue to raise yours.

That's all there is to it.

That's the foundation of computer science.

Now, let's give it a try with some addition.

But how?

We're supposed to add with these?

0 plus 0 equals 0.

1 plus 0 equals 1.

1 plus 1 is 2.

OK, I get it.

That big flag of Kohaku's indicates a 2.

Yes, let's go.

That is so cool.

We're adding up all these numbers without even trying.

But I mean, it's not like those weren't super obvious answers, you know.

Circuits will produce those kinds of obvious answers perfectly,

and there are lots of ways to put 'em together.

This is basically just baby stuff.

All a half adder needs is an XOR and an AND gate.

Yep, just one sentence out of your mouth and I'm completely lost again.

Not just you.

I'm from the 21st century, and I can't follow him either.

Don't you realize it's pointless unless you can make that happen rapidly and electronically?

You said yourself that semiconductors are 10 years away.

We're stuck in the stone world.

How would you make--

We're making them with donuts.

What'd you just say?

They're cheap, fast, and sturdy.

It's an obscure but useful component from Japanese computing history.

Some call it the donut computer,

the parametron.

All you got to do is wrap a wire round and round a tiny donut made out of copper and zinc,

and then you'll end up with this bad boy.

So fast!

And I suppose you'll want us to make, like, 800 of them, won't you?

Let's just do five for now.

No way!

What's up, guys? Mecha Senku's back.

Basically, think of a parametron this way,

like a tiny electric swing.

The electric oscillations are constantly swinging back and forth.

If you have some going forward and some going backward,

the direction of the swing is always decided by majority.

And that's the idea behind the parametron.

Yeah? Well, I'm still confused as hell by the science of it.

But when you add 1, the output increases by 1?

And that's how it can do basic addition, right?

Senku's going to teach us how to make those little thingies so we can help out, too.

No way. That's impossible.

Don't be like that.

We were able to make those diamonds, now, weren't we?

It's like he says,

anyone can do science with a good road map.

Hey, do you mind if I try it?

Do I mind?

Actually, I insist on it. Because you need to get acquainted with the machine

since you're heading up our computer squad.

Yeah, that's easy.

I don't know why we need something special for that.

I mean, we can all figure out 1 plus 1 is 2 or whatever, right?

But if we manufacture and connect a bunch of these parametron adder circuits together,

it'll take time.

But little by little, we'll be able to work with bigger numbers.

Keep doing that,

and it'll surpass...

human ability.

I can't wait to build them.

We'll finally have my beloved computers again.

This is so exciting.

So, um, we're gonna be connecting a whole bunch of them, huh?

I've got a feeling that this is gonna get ridiculous immediately.

What's the catch?

That we're gonna have to crank out, like, 800 of them?

200k.

We'll be making some machines to manufacture tons of those donuts.

So welcome to the age of automation.

That said, it'll take a bit of grunt work to wrap the wires around them.

Perfect job for Yuzuriha and her crafts team.

Of course, we can wake up a bunch of people in Corn City to increase our manpower.

The computer is the pinnacle of human crafting,

and to build it, we'll need machines,

plus good old manpower,

meaning we're gonna need everyone working together on this.

So what do you say?

I say yeah!

Yeah!

We're going to bake a metric crap ton of donuts