An AI pointed at a messy spreadsheet stumbles in specific, catchable ways. This video shows them: duplicate customers, blank cells, mismatched dates. The point of the exercise is one honest number.

I built software so polished I wrote the manual myself. It sold nothing. The buyers were already doing the job on Unix, and they wanted it rock solid, not prettier.

A chip supplier rationing parts favors the customers it knows exist. A hardware startup that buys its boards through a contract manufacturer stays invisible to it until someone at the startup picks up the phone.

At Trinity, Fermi dropped scraps of paper as the blast wave hit, watched how far they flew, and did a little arithmetic: about ten kilotons. He had that number before the instruments reported. You can put a number on your own unknown the same way, from parts you can guess.

Anthropic's $80B half-year loss is smaller than two accounting lines in its own IPO filing. Together they come to $81.1B. Take both out and the half-year lands about $400M ahead, carried by roughly $1.1B of interest on raised cash. Totals are my arithmetic.

Microsoft offered buyouts to about 60,000 employees and expects 3% to 5% to take them. A sweeter retirement offer this year went to 8,700 people, and about a third said yes. Each person compares the package with what they'd do next, and the terms decide who comes out ahead.

Cold email, Reddit, LinkedIn, referrals: most first-customer advice is a menu of channels, and a menu can't tell you what to do on Tuesday. A calendar can. Week one is the list, week two is conversations, week three is the offer, week four is follow-up.

You will always feel you deserve a raise. That feeling tells you nothing. Check revenue trend, runway and margins instead. All three green, take it. One red, wait a quarter.

You'd know exactly what to tell a friend who had your problem. Say it to yourself and it goes soft. Researchers have a name for that gap, and a cheap way to close part of it: write about your day using your own name instead of "I."