Dr. Stone: Season 1, Episode 21

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With Chrome and Kaseki’s water wheel finished, Ishigami Village moves into the age of electricity! But with the primitive materials available to him, will Senku be able to create a filament that can withstand the intense heat of operating a vacuum tube?

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1. Now that we have gears and a waterwheel,

2. the age of manual labor has officially ended.

3. With an infinite machine that requires no fuel...

4. we're finally truly harnessing

5. the incredible power of nature.

6. Say goodbye to relying on manpower,

7. and hello to the age of energy!

8. So what is this thing?

9. A hydroelectric generator.

10. Hydroelectric...?

11. Generator...

12. This is on another evel-lay. You realize that.

13. Don't look at me for this one.

14. You can thank Chrome and old man Kaseki.

15. They built this gigantic waterwheel on their own.

16. It's not done yet, though.

17. All of the precious electricity this is harnessing

18. is still leaking away.

19. Um... okay. What do you mean by that?

20. I mean, we need to build containers for it.

21. Uh! Wait, we can store that spinning power?

22. Yeah. Although they're gonna be kind of a pain to build.

23. Heh. So get off your asses, you two!

24. We've got an insane amount of hard-mode crafting to do

25. before we're able to make our cell phones,

26. so there's no time to rest.

27. That's bad.

28. It's the beginning of our very own Spartan crafts club.

29. This is gonna be fun. Get excited!

30. To make our container, otherwise known as a battery,

31. we take two sheets of lead, put 'em in a bottle,

32. and introduce 'em to our two-faced goddess Sulfurina.

33. Who's that? Oh, the sulfuric acid.

34. Feed some electricity to this and we've got stored power!

35. It's simpler than you'd think, isn't it?

36. Yeah, I'm sorry. What about this process has been simple?

37. Now we just make five more of these and connect 'em all.

38. I know that we're the crafts team and all,

39. but have some compassion!

40. We just worked three days straight and now this?

41. I dunno... are these tiny things really holding

42. all that much power?

43. We had to work our butts off to spin—

44. Yep, it's definitely all in there!

45. So does that mean that Kinro and I don't have to do

46. all that grueling work by hand anymore?

47. You bet. Never again.

48. I told you, didn't I? We're in the age of energy now.

49. Hooray for the age of energy!

50. I'm not surprised Ginro's happy.

51. But even the diligent, hardworking Kinro's celebrating.

52. They turned that thing so much.

53. Must've been a tougher job than we thought.

54. It's not like you're free from labor.

55. We're just gonna use your manpower elsewhere now.

56. And finally, the fighters can focus on their training!

57. Put your back into it!

58. We only have a few months until the big battle.

59. You need to be in shape to beat Tsukasa and Hyoga by then!

60. This is not the best time to be taking a break, you guys!

61. I don't think I can take much more!

62. Old Man Kaseki's gonna die at this rate!

63. Well, there's one additional use for the waterwheel

64. that's worth croaking over!

65. It's time to make us some gears, you guys.

66. They'll work off of the waterwheel's constant motion.

67. Damn it, it broke again!

68. I thought I copied the blueprints perfectly.

69. Because there's only teeth on half of the disk,

70. they catch the top and bottom in turn,

71. which converts the rotational motion

72. into a back and forth one.

73. These ideas humanity came up with are incredible! And badass!

74. Now you've done it.

75. The craftsman in me is getting so excited

76. it's starting to piss me off!

77. Here, kid.

78. Why not leave the intricate work to a professional?

79. Uhh.

80. They were worn out until a second ago,

81. but now they're being all tough

82. just 'cause they saw some drawings?

83. Is this what I think it is?

84. We've upgraded our blowing capability again!

85. Level one!

86. Level two!

87. And now, level three!

88. Blowing air into the furnace

89. was the most exhausting work we had to do

90. to get a bowl of ramen!

91. The hellish iron-making work has finally been mechanized!

92. Hooray for the age of energy!

93. Like I said, this doesn't mean you're done with labor!

94. And finally, the non-fighters can focus

95. on prepping for the winter!

96. This is all brand new to me.

97. Ah. Is this that bottling thing you mentioned?

98. Yes, the ancestor of canning.

99. Oh, boy.

100. I can't believe we can preserve meat for the winter.

101. I must be in heaven!

102. So what's the Spartan crafts club making this time?

103. Light bulbs.

104. You know, that's absolutely azy-cray,

105. but I'm starting to get used to being blown away at this point.

106. This gets up to about 2,000 degrees Celsius

107. once it's lit,

108. which makes the metal connections melt apart.

109. So to keep it all together,

110. we're gonna have to use glass as an adhesive.

111. This is such delicate work,

112. even I'm a little stressed about it.

113. Aw, bad! Why is this so hard?

114. What's the matter? Are you gonna give up already?

115. Hm? Not at all!

116. Although my body gave up a long time ago.

117. I knew I could always count on a craftsman's spirit.

118. Sheesh.

119. I've lived such an easy life here for the past 60 years.

120. Huh?

121. But, Senku, ever since you showed up,

122. it's been a hell of a lot harder, that's for sure.

123. But more importantly, it's been a hell of a lot more fun.

124. Aside from a select few of us here,

125. I bet everyone in the village feels the same way.

126. Whoa, cool.

127. But last time we made a light source like this,

128. didn't it burn itself out immediately?

129. You know, that time up on the roof?

130. So what's the plan?

131. Well, when you want something to burn, what do you do?

132. You feed it a ton of extra air with a blowing machine,

133. like what we started doing with the waterwheel?

134. Then what do you think you would do

135. to keep something from burning?

136. Hmm...

137. Take the air out of it?

138. We'll take advantage of the way mercury absorbs air.

139. It'll suck it out of the lightbulb as it passes by,

140. creating a vacuum.

141. No matter how hot it gets,

142. if it doesn't have access to air, it won't burn.

143. That's why it can last for such a long time.

144. It won't burn out like the last one.

145. Senku, I brought everyone like you told me!

146. Great. Just hang out for a sec. Almost time.

147. Huh?

148. Ah, bad. It's snowing.

149. We callin' off the test?

150. No. I'd like to do it today.

151. Hm?

152. All set. Ready whenever you are.

153. Tch.

154. Good. Then let's turn this on.

155. So pretty!

156. They're like twinkling stars sitting right in the tree!

157. Some decorative lighting.

158. It feels like I'm suddenly back in the old days. How fun.

159. It took us two whole months.

160. Oh, man. That's a long time, isn't it?

161. Nah, we're right on schedule.

162. Huh?

163. Wait a second.

164. Don't tell me today's actually... Christmas!

165. Oh, yeah.

166. Now that you mention it... it's quite the coincidence.

167. You liar.

168. Whoa, I got a bad idea!

169. Let's go check out the caves!

170. We can go way deeper than we could before!

171. And we won't need torches anymore!

172. Right.

173. With the help of batteries and light bulbs,

174. we could go ten billion times farther.

175. I bet there are loads of cool rocks

176. that were hiding just beyond our reach!

177. I hope you're ready to go, science spelunkers!

178. We're gonna nab us some bad mineral resources!

179. Hear that, Senku?

180. You may be leagues ahead of me in science,

181. but when it comes to exploring,

182. I'm ten billion times more skilled!

183. Naturally. You have experience.

184. What do we need?

185. Just name it and Captain Chrome will go find it for you!

186. We gotta be missing something!

187. We have that whole cell phone roadmap to complete!

188. Oh. What materials we're missing?

189. None.

190. What do you mean "none"?

191. We already have everything it takes.

192. Thanks to our hard work in our previous missions.

193. Then do we actually have a reason

194. to go exploring at the moment?

195. We're short on labor as is.

196. I'd bet anything he just wants to go

197. 'cause he's got some new gear.

198. He gets to play with it while we work.

199. Well, it wouldn't kill us to have

200. some extra copper lying around.

201. There's no telling how much we'll use

202. during our next brutal crafting session.

203. Yeah, there it is. I knew there had to be something!

204. Leave it to me!

205. Just be back here soon.

206. Like, at latest, New Year's next week, all right?

207. So... what's this brutal crafting you mentioned?

208. I wouldn't mind having something complicated done

209. by the time Chrome's back to surprise him.

210. You can think of it as a next level light bulb.

211. Oh-ho! The regular light bulb was already brutal!

212. This sounds like it's gonna be a challenge!

213. We're making computer eggs.

214. Basically, electronic gears. Vacuum tubes.

215. Vacuum tubes, huh?

216. We're getting to the point

217. where I have no idea what you're making.

218. Or, rather, I do know, but I've only ever heard the name.

219. If you asked me what they actually do,

220. I wouldn't be able to tell you.

221. They emit electrons when their temperature increases,

222. letting us control the direction of the current

223. and make it stronger.

224. Like I said, you can think of them

225. as the gears of electricity.

226. They're the heart of a cell phone.

227. This is still tough work, but it's almost the same

228. as what I had to do to make all those light bulbs.

229. Yeah.

230. But as the name vacuum tube would suggest,

231. it's a vacuum.

232. So we've really gotta get rid of all the air inside it.

233. We'll place a bit of phosphorus right on the filament,

234. where it'll get hot.

235. That little flame will burn up all the oxygen inside and—

236. Oh! I swear I didn't do anything different!

237. It looks like the cracks started at the base of it!

238. The wires are expanding.

239. Huh?

240. We've got a metal line going through the glass

241. and it expands a bit from the heat

242. of the burning phosphorus.

243. That size difference of just a few microns broke the glass.

244. We're dealing with change that's happening

245. on the scale of microns?

246. What do we do then? This is errible-tay!

247. This kind of thing's normal.

248. Nothing ever works right on the first try, does it?

249. Yeah, it's just trial and error.

250. When is it ever anything else? Let's give it another go.

251. Yo! Guess who's back?

252. Hm?

253. I copped me some copper!

254. Uh. No pun intended?

255. Hey, your timing couldn't have been better.

256. Okay, then. A copper tube?

257. It makes the most sense.

258. A tube will expand inward instead of out,

259. which means our glass won't crack.

260. It's finally working!

261. Boy, these vacuum tubes sure gave us a hard time.

262. That's bad.

263. The bamboo filament, it just burned out instantly!

264. Damn it all.

265. Bamboo filaments are just fundamentally too weak

266. to use in vacuum tubes.

267. Ha.

268. I'm not gonna claim to understand

269. the science behind it, but basically,

270. we need something stronger.

271. Then what's your call?

272. Captain Chrome is ready to ship out at any time!

273. No.

274. We might be outta luck.

275. There's nothing better in this era.

276. What about this one?

277. Okay, these are all the minerals

278. I was able to collect in the caves around here.

279. There's gotta be one we can use! Something!

280. Anything strong enough to take the heat!

281. Ooo, this one looks like a gemstone!

282. That's a jewel bug corpse, actually.

283. What about this?

284. It's really dark, but light as a feather!

285. Must be special!

286. Raccoon poop.

287. Ah, poop!

288. A dead end. After coming this far.

289. I may not be a rock doctor like Senku is,

290. but I've seen a lot of rocks

291. while playing in the mountains and forests.

292. So maybe I can find a rare rock that could help us out,

293. and be useful to everyone.

294. If we can't make cell phones,

295. we can't make cell phones.

296. I don't have time to sulk.

297. Come on, just think of something else.

298. Oh, Senku! Wakey-wakey!

299. It's officially the new year.

300. And everyone's planning to go watch the sunrise together.

301. It's important to have a mental reset

302. every now and then.

303. Trust me, I would know.

304. Yeah, yeah, you're a mentalist. I get it.

305. Uh. I wanna come, too. Wait up, you guys!

306. Suika, were you going through rocks all night?

307. It's because you want to be useful, too, huh?

308. That's right.

309. Already New Years. My internal clock is messed up.

310. Must be due to the petrification.

311. I couldn't even tell you how old I am anymore.

312. Don't you know how many days you've been alive?

313. Uh?

314. Who in their right mind could possibly remember such a thing?

315. You don't, right, Senku?

316. Six thousand, two hundred and sixty-eight.

317. We're almost there.

318. The sun is just about to rise.

319. A blue... gemstone?

320. So pretty.

321. Uh. Huh? But— What the—?

322. Why is it glowing?

323. I can tell you why. It's scheelite.

324. It glows blue when exposed to ultraviolet light.

325. Reactions to ultraviolet light are especially visible

326. right before the sun rises.

327. So only right now.

328. It would only glow in this moment?

329. Quite the poetic magic rock.

330. I've never seen this. Like, ever!

331. Yeah, you're not the only one.

332. That's an ultra-rare mineral right there.

333. An insanely good find from the Chrome and Suika tag team.

334. This is the exact stuff used in 21st century filaments!

335. Atomic number 74: Tungsten!

336. The strongest metal known to man,

337. that can't be defeated by heat!

338. This small chunk won't be enough,

339. but it came from upstream in the cave.

340. So there's gotta be more farther inside.

341. A bona fide treasure trove of this heat-resistant tungsten!

342. We only have one set of lights left,

343. so the last member of the exploration team'll be...

344. It shouldn't be me.

345. I have to keep training our fighters.

346. But who, then?

347. If I'm called upon, I will go.

348. Yeah, no way!

349. Just pick one of the others. I'm too scared!

350. If they need me,

351. I'll make myself as useful as I possibly can!

352. I wouldn't mind, but we're exploring caves, right?

353. My back may give out.

354. I get the feeling you won't be needing

355. a mentalist in the caves.

356. Magma.

357. Tungsten's tough as hell,

358. so we're going to need your brute force to collect it.

359. We're a trio of spelunking buddies—

360. you ready to go cave diving?

361. To the real live treasure dungeon!

362. Buddies?