Dr. STONE (Dr.STONE)

We've cleared plastic!

We've cleared wire!

We've cleared vacuum tubes!

We've cleared microphones!

We've finally completed our extra huge science project!

Copper

Coal

Charcoal

Beehive

Sulfuric Acid

Lead

Tin

Solder

Gold

Wire

Coil

Mercury

Vacuum Pump

Phosphorus

Rochelle Salt

Beehive

Battery

Circuit Board

Vacuum Tube

Light Bulb

Wine

Microphone

Headphones

Cell Phone

Voices Over Infinite Distance

We've come so far, building a scientific civilization from scratch

Ramen

in this stone-riddled world.

The strongest weapon in modern warfare,

delivering voices over infinite distances...

The cell phone is born!

Yeah!

Our voices are going to travel across the skies and far into the distance.

It's so strange.

Yeah.

So it's great that we're sending our voices over long distances...

But how are we going to hear them?

Whoops! We're going to need another one.

You kept quiet about that on purpose, didn't you?

Because people might give up if you told them we need to make two.

We needed more than one cell phone!!

Tee-hee.

We do need another one to make it work as a cell phone.

But if we run a long cable, it should work as a phone.

Ruri can hear me if I talk through here, right?

Ahem.

Chrome, have you chosen your historic first words for the phones

we've finally built?

Ruri-chan's listening on the other end.

Come on, it's your chance to tell her how you really feel.

This is your moment.

My true feelings...

Hit the switch!

It's on!

Ruri...

Did you see that, Ruri? Pretty awesome, right?!

Science is insane!

What's up with you all, anyway?

I heard them!

It worked!

How does this thing work?

I'm shocked.

That was definitely Chrome's voice.

I don't get it.

How can something so tiny speak?

It's almost like a speaker.

"Almost like"? It's literally a speaker.

Microphones and speakers just convert between sound and electricity.

They're the same...

Ruri.

What did you just say?

"It's almost like a speaker"?

Huh, a speaker?

So is this a bee?

It's a bee! A bee!

Huh? Speakers are bees?

Um, I mean... aren't speakers a kind of bee?

How did that happen?

It was in the Hundred Tales.

That's how it was passed down?

Yes.

In tale 14 of the Hundred Tales...

There's a talkative bee named Speaker.

When it poked gravestones with its needle,

it could speak in the voices of the dead.

Speaker...

Needles on gravestones...

Voices of the dead...

That story isn't transferring any kind of knowledge.

I don't get what it's for.

That's super suspicious.

It's using the word "speaker" to try to

communicate something only to modern humans.

And it's tale number 14.

One and four, or "i" and "shi," as in "ishi (stone)."

It's your birthday.

It's said that these are the graves of Byakuya-sama and the other founders.

My old man's gravestone...

The cemetery!

What do you think you're doing, Senku? That's sacrilege!

What? Is there something about that gravestone?

I should have noticed a lot sooner.

That man is such a pain in the ass.

Just the gravestones of the founders?

Now that I think about it, that's ten billion percent bull.

This isn't a gravestone.

It's a time capsule that's been kept solid in concrete.

A time capsule?

Is there something inside it?

Yeah, we need to break it to get inside.

We're breaking it, then?!

Hold it, meat head!

If I'm right, there's glass in this.

We're going to need someone with both power and speed to crack it swiftly.

So fast!

There's something inside!

It's some kind of silver chunk.

It's silver because it's wrapped in aluminum foil.

If we wash it with hydrochloric acid...

It's actually glass!

A saucer?

It looks like they cut out the bottom of a bottle or something.

A saucer.

Speaker.

Speaking with needles.

Does that remind you of anything?

It's a record!

My dad and the crew's voices are on there.

They bothered to leave us a voice recording.

Let's hear what they had to say.

I'll kill you if it isn't something exhilarating,

you deadbeat dad.

Chrome was right.

Science truly is beautiful.

It lets Senku-san's father speak to him from heaven.

Now, thousands of years later, traveling through time with science.

Hey, Senku...

Does that mean that "record" thing can trap sound?

B-B-But you can't even catch sound.

I'm so confused.

How?

The way a record works is ridiculously simple.

Hella lit!

You make a needle vibrate with sound, which digs grooves into the record.

And then, if you run a needle over the grooves to vibrate it,

it'll make the same sounds that dug them.

Hella lit!

Digging grooves in glass makes it store sound?

That's a surprise.

Senku's dad is awesome!

Nah, that's not true.

Byakuya couldn't have done it.

It must have been the people with him that made it.

Astronauts are all science elites.