I keep a running list I call Content Bites. It's not a to-do list, not a reading list. It's a list of questions I've encountered — in conversation, in something I read, in some idle Tuesday moment — that I can't leave alone until I understand the answer well enough to explain it to a ten-year-old.

The ten-year-old test is specific and demanding. It rules out pseudo-explanations that use technical language to simulate understanding. You can't explain the Coriolis effect by saying "it's a fictitious force in rotating reference frames" to a ten-year-old. You have to find the real thing.

Some questions from the list

Why can't we divide by zero?

Not "the calculator says error" — why, actually? What goes wrong mathematically? This led me through about two hours of thinking about limits, the structure of division as repeated subtraction, and what it would mean for a number system if zero division were defined. The answer is satisfying. The answer is: you can define it, but the system you get is either useless or inconsistent.

How does a refrigerator know when to stop cooling?

I grew up in Rajkot. The refrigerator was important. I had no idea how it worked. Understanding it — the refrigerant cycle, the compressor, the thermostat — took me a while, but the thing I love about it is how elegant the physical principle is. The phase change between liquid and gas moves heat. That's it. That's the refrigerator.

What's so special about Pride and Prejudice?

I am not a literary scholar. I'm an engineer who reads for pleasure. But this question nagged at me because "widely considered a masterpiece" is not an explanation. After a few weeks of thinking about it (and rereading parts of the book with this question in mind), my answer is: it's the first novel in English where the heroine is smarter than almost everyone around her, and the text knows it, and doesn't apologize for it. The interiority is the point. Every sentence is doing double work.

Why do we yawn when we see someone else yawn?

Current best hypothesis: it's an evolutionary mechanism for coordinating alertness within a group. If one member of the group is fatigued, it's adaptive for the rest to register it. I'm not completely satisfied by this. The list continues.

Why did the Soviet Union collapse when it did, rather than ten years earlier or ten years later?

This one is still on the list. I have a partial answer. It involves oil prices, glasnost as an uncontrolled variable, and a military that no longer believed in what it was defending. But I can't explain it to a ten-year-old yet.

Why this habit matters to me

The Content Bites practice is about maintaining a particular relationship with not-knowing.

Most professional environments reward the appearance of knowledge. You're not supposed to say "I don't know how refrigerators work" in a strategy meeting. You develop a conversational style that covers the gaps without revealing them.

The Content Bites list is my private counter-program. It's a place where I am explicitly tracking the things I don't understand, and taking them seriously enough to work on them.

The discipline has side effects I didn't anticipate. The questions from completely different domains turn out to have structural similarities. The zero-division question and the "why did the Soviet Union collapse when it did" question share an underlying logic: they're both about what happens when a system loses its invariants. Understanding one sharpened my thinking about the other.

I don't know what I'll find at the bottom of the list. I'm not sure there is a bottom. But the habit of maintaining it — of treating "I don't know" as the beginning of something rather than the end — is one I want to keep for a long time.

The list as of today

Some questions currently on it:

  • Why does music in a minor key sound "sad" — and does it sound sad to people who grew up with different musical traditions?
  • What actually happens in a bankruptcy proceeding for a large public company?
  • Why did writing systems develop independently in multiple places but arithmetic seems to have diffused from fewer origins?
  • Is there a meaningful distinction between being risk-averse and being loss-averse, and how does it cash out in practice?
  • How does anesthesia work? (Not "it puts you to sleep" — why does it work? The mechanism is genuinely unclear.)

If you have good answers to any of these, I want to hear them.