I own a titanium tea set because a man named Tynan likes tea.
Tynan has lived out of a single bag since before anyone called it being a digital nomad, and every year he publishes a list of the gear he owns and still uses. I buy most of it, 80 or 90%. I've never compared his picks against anyone else's. I like the way he thinks about the world, and whatever he recommends, I buy because I respect him. Some of what I carry from his lists is more than ten years old. That's his rule at work, and it's mine now too: buy the best you can find, because it will last, or the cheapest, because it won't matter, and never anything in the middle.
The cups fold down small. There are saucers too, also titanium, because Tynan is into titanium. He tries the tea wherever in the world he happens to be, with whoever is around. So I bought the set and tried the tea thing for a while. That is how I found out I'm a water person. I'll drink whatever is in front of me, I'm perfectly fine with no taste at all, and the set was extra weight in the bag.
I'm not faulting him for it. I'm glad I tried it, just to find out it wasn't for me.
Eight Keys
On the evening of October 17, someone credited only as Wayne sent a message to the people at Apple, Google, Microsoft and Mozilla who decide which companies your browser trusts. It said We have a problem here. Wayne signed it eight times, once with each of eight secret keys that only a certificate authority in India was ever supposed to hold.
You rely on a certificate authority every day without knowing its name. When your bank's website shows a padlock, a company like this has vouched that the site really is your bank, and your browser believes the company because Apple or Google or Mozilla does. The vouching rests on a secret key, a random 384-bit number, so long that every computer on earth could guess until the sun burns out and never hit it. This company was eMudhra, of Bengaluru. Eight of its keys were 56, 66, 115, 155, 156, 230, 237 and 4.
They were made on April 30, 2025, at a key ceremony, a formal, scripted procedure run on locked-down hardware so that nothing goes wrong. eMudhra's own team ran it. By the company's account, an approved change partway through, meant to test exporting the keys, ran a script with a flaw in it, and the flaw made a second, weak key beside each strong one. The weak ones had labels close to the real ones. Somebody used the wrong set. The certificates built on them chained up to an eMudhra root that sat in the trust stores of Firefox, Chrome, Apple and Microsoft, which is to say on nearly every phone and laptop on earth.
Within weeks there was a clue. The lists these certificates use to announce revocations started failing their signature checks. They had been signed with the strong keys, and the certificates were built on the weak ones. eMudhra's fix, as the security engineer Ryan Hurst later put it, "was to start using the weak keys, because they were the ones that matched the certificates." An auditor's report afterward covered all eight keys, noted that incident, and found nothing to object to.
Wayne found the keys with a free tool. Chrome blocked the certificates within two hours of the report. When the news went public three days later, another security researcher, Scott Helme, tried it. I recovered all of them from their public certificates on my laptop just now, he wrote, and it took less than a second. Hurst went back through everyone who had been in a position to see it. "Audits examined controls. Root programs examined disclosures and incident reports," he wrote, and so on down the line. "None of them examined the keys, and nothing required any of them to." The rest of the system, he counted, had seventeen months, a public incident on the same certificates, two audit reports and an inclusion review. "Plenty of people could have caught it. Nobody was assigned to."
One of Those People
I'm one of those people.
I lurk. I've spent years on forums, Discord channels, Reddit and the anonymous boards, reading and almost never posting, and I don't trust much of what I read there, because you can't tell who is behind a handle, or whether it's a person at all. I'd rather work things out for myself. Then I install open-source libraries I've never opened, because so many people use them that one of them must have looked. If you asked me which one, I couldn't give you a name. This week I explained my reasoning out loud, to the same AI that writes my code, and it came out like this: Other people do their due diligence. So I basically trust them.
The code is the same story. On Claude Opus 4.5 I was still somewhat looking at what the agent wrote. From 4.6, I stopped. Each version was better than the last, and I trusted the next one more. Now one agent writes, a second reviews and leaves notes, the first fixes what the second found, the second looks again, and when they agree, a message tells me the work is done. I'm building an app this way. The errors that used to reach me hardly do anymore. I'd like to give the reviewing agents the credit, and they may deserve it. But I stopped reading at 4.6, and fewer errors reaching me is exactly what I would see either way.
Smoke
In 1968 two psychologists, Bibb Latané and John Darley, sat students in a room to fill out a questionnaire and pumped smoke in through a vent in the wall. Students who were alone noticed it within about five seconds. Students sitting in threes took longer to notice, and then they stayed in their chairs. The smoke got thick enough to blur their vision. It stung their eyes and made them cough. Across all the groups, one person reported it in the first four minutes, and in five of the eight groups nobody reported it at all.
Robert Cialdini, who built a chapter of Influence on research like this, called it social proof: when we're unsure what's happening, we watch each other. His most famous example came from Queens. Early on March 13, 1964, a young woman named Kitty Genovese was stabbed near her apartment in Kew Gardens, and two weeks later the New York Times reported that thirty-eight of her neighbors had watched and none had called the police. The story launched a whole field of research. It went into the textbooks, and into Cialdini's book, which is where I found it. I trust Influence because Charlie Munger did; he gave Cialdini a share of Berkshire Hathaway to thank him for it. Cialdini had the story from the Times.
It wasn't true, at least not the way it was told. The number traced back to a remark by the police commissioner, and nobody confirmed it before it ran. Most of the thirty-eight hadn't seen the attack, and none of them could have seen all of it. In 2016 the Times admitted that its story had "grossly exaggerated the number of witnesses and what they had perceived." When the trouble is loud and plain, real life is kinder than the legend: in two hundred and nineteen public conflicts caught on CCTV in Britain, the Netherlands and South Africa, at least one bystander stepped in nine times out of ten. The smoke in that room was quiet, and nobody was sure what it meant.
The Stairs
A little after three that morning, a scream woke Sophia Farrar, her husband Joseph and their son in their apartment nearby. They looked out the window. They saw nothing, and they went back to sleep.
A while later the phone rang. A neighbor was calling to say that Kitty, who was Sophia's friend, was hurt, in a hallway at the back of the building. Sophia told the caller to get the police. Then she went.
Joseph was still getting his pants on. Sophia ran down the stairs without knowing whether the man with the knife was still there. He wasn't. She found Kitty on the floor, bleeding and barely conscious, and she got down and took her in her arms. She rocked her. She shouted to another neighbor to call the police. She told Kitty, Help is on the way, and she held her until it came. Kitty died in the ambulance.
The famous story is thirty-eight people at their windows, and Sophia isn't in it. The Times printed her name only once, in a story about the trial, and one of the paper's later executive editors called leaving her out inexcusable. She lived to ninety-two. Half a century after that night, in a documentary, she said she only hoped Kitty knew it was her, that she wasn't alone.
Teeth
In 1894 a Bengali teacher named Sri Yukteswar wrote a short book called The Holy Science, and in its third chapter he argues from the shape of our teeth. In meat-eaters, he writes, the canines are long, smooth and pointed, to seize the prey. In fruit-eaters they are "little projected, conical, and blunt," and all the teeth are of nearly the same height. Then he looks at ours: "They do resemble, exactly, those of the frugivorous animals. The reasonable inference, therefore, is that man is a frugivorous or fruit-eating animal."
I know most anatomists today would call us omnivores. I still believe him, and I know how that sounds in an essay about checking. I love fruit, oranges most of all, for the sweetness and the juice, more than I have ever loved a vegetable.
Near the start of that chapter he explains why he is arguing from teeth at all. Our senses, he says, have been so perverted by unnatural living from infancy that little reliance can be placed on their judgments. "To understand, therefore, what our natural needs are, we ought to depend upon observation, experiment, and reason."
I came to Yukteswar through my own guru, Paramahansa Yogananda, who was his disciple. I trust Yukteswar because I trust Yogananda, and that's part of it. The other part is that the trust sent me to read him, and he told me to check. It works that way with code too, at its best: a developer you admire keeps praising some other project, and you go and look, because you want to see what they saw. When I tried to explain this out loud, it came out like this: you also want to do your own due diligence… not because you kind of doubt them, but it's almost like a sign of respect.
The Swarm
Machines are starting to do the looking. Agents read code all night while the people who own them sleep, and other agents check their work. Somewhere, quite possibly right now, one of them is running the next key that is the number 4, and it will take less than a second. It won't be doing it out of respect for anyone.
A Blast from the Past
I did meet Tynan, once. He lives in Las Vegas now, and he ran a small gathering there for about ten of us. Instead of a conference room he rented a penthouse room at the Hard Rock Hotel, which turned out cheaper and better. He'd brought his tea set, a big pot of hot water and tiny Chinese cups that hold almost nothing. We sat on the couches in something like a circle, and each of us took a turn bringing up whatever he wanted to talk about, and Tynan talked it through with him, and at the end the rest of us pitched in.
At some point someone suggested we all bring our backpacks and do a show-and-tell. When my turn came I unpacked a decade of Tynan's old recommendations. He picked up my sunglasses, a pair of folding Ray-Ban Wayfarers I've had for more than ten years, scratched across the lenses and still working. Tynan had given his up years before, for a pair so thin they get lost in a pocket. A blast from the past, he said, and he meant it almost as a compliment. For a few minutes he went back through his own old list, one item at a time, out of my bag.
I didn't follow him to the thin ones. They seemed too flimsy for me. When my old pair got too scratched I bought the same Wayfarers again, with a reddish-orange tint where the old ones were green, and I still switch between the two. The jackets I did upgrade, and I gave the old ones to my father: the sky-blue rain jacket, and the down jacket without pockets. He still uses them.
All through it, Tynan kept checking everyone's cups. If yours was turned up and empty, he filled it. If you were done for the day, you turned it upside down, and he knew to pass you by.
I kept mine turned up.
From the Road
Machines read this before you did, the way they read my code, and I took some of their notes. Then I read every word of it out loud, which is more checking than I've done on anything in a while.
— The Pilgrim Age