0:00 The words you’re hearing right now were likely encoded into signals of light, moving at about one hundred and twenty-five thousand miles per second through a thin fiber of glass.0:13 Wow.0:13 And that’s exactly what we were talking about last week with paper, isn't it?0:19 Another one of those hidden giants.0:21 A technology that’s so fundamental it just… disappears.0:25 It completely disappears.0:27 And glass is maybe the ultimate example.0:30 We look through it, not at it.0:32 But for most of human history, it was the opposite.0:36 It was a statement piece.0:38 It started, probably by accident, around 2500 BCE in Mesopotamia.0:43 An accident?0:43 How do you accidentally invent glass?0:46 Well, the theory is it was a byproduct of metalworking.0:50 You’re firing up a kiln to smelt ore, and the intense heat fuses sand and ash into a glassy slag.0:57 For a long, long time, that’s all it was—little trinkets, colorful beads.1:03 A luxury.1:03 For centuries, having a glass window was like having a private jet today.1:09 Okay, so when did that change?1:11 When could a normal person finally get a window without taking out a mortgage?1:17 Not until the 1600s, really.1:19 The big shift was the invention of glassblowing around the first century AD.1:24 Suddenly you could make vessels and different shapes much more easily.1:30 But flat, clear glass for windows?1:32 That remained incredibly difficult and expensive.1:36 It was the invention of the float glass process in the 1950s that finally made giant, perfect sheets of glass cheap.1:44 The 1950s?1:45 That late?1:46 That late.1:46 It’s a pattern we see over and over.1:49 Think of aluminum.1:50 It was once more valuable than gold; Napoleon the Third served his most honored guests with aluminum cutlery.1:58 Then, a new process makes it cheap, and suddenly it’s what we use for soda cans.2:04 Glass followed the same path.2:06 You know, the other thing is safety.2:09 I mean, my car windshield is glass, but it doesn't shatter into daggers.2:14 That couldn't have been an accident.2:17 Uh, it was.2:18 It was one hundred percent an accident.2:21 In 1903, a French chemist named Édouard Bénédictus dropped a glass flask.2:26 It cracked all over, but it didn't shatter and fly apart.2:30 Wait—why not?2:31 Because it had previously held a cellulose nitrate solution, which left a thin, invisible film on the inside.2:39 That plastic film held all the broken pieces together.2:43 He saw it, had that moment of insight, and patented it as laminated safety glass.2:49 Almost every car windshield today is a direct descendant of that clumsy moment in a Paris lab.2:56 That is… incredible.2:58 So from a luxury bead, to a status-symbol window, to this invisible, life-saving material that’s everywhere.3:06 Exactly.3:06 And now, it’s gone a step further.3:09 It's not just a physical barrier anymore.3:12 We’ve perfected it to the point where it’s become the primary channel for information.3:18 Fiber optic cables are, as one writer put it, thirty times more transparent than the purest water on Earth.3:26 Whoa.3:26 We needed that level of absolute, perfect clarity to shoot light through it for miles without losing the signal.3:35 We took this ancient material and pushed its core property—transparency—to its theoretical limit.3:42 So we went from looking through glass to see the world outside, to now looking at glass to see a world that's delivered through it.3:51 That… feels like a really big shift.3:54 It is.3:54 And it brings up its own problems.3:57 The same fiber optics that connect a doctor to a patient across the globe also deliver misinformation at the speed of light.4:06 The material itself is neutral.4:08 It just does its job perfectly.4:11 It transmits what we give it, for better or for worse.4:15 Hmm.4:15 It just makes the world more of what it already is, faster.4:19 Maybe.4:20 Or maybe it makes us more of what we are.4:23 The thing about a technology becoming invisible is that you stop questioning it.4:29 It just becomes part of the scenery.4:31 And I wonder what happens when the thing shaping how we see everything is the one thing we no longer see at all.
