

Ryan Johnson
4.9K posts

@ryanmjohnson
Builder and resident @culdesac. Was founding team @opendoor, @baincapital, @mta. Dm for ebike recs



Today, we share a breakthrough on the planar unit distance problem, a famous open question first posed by Paul Erdős in 1946. For nearly 80 years, mathematicians believed the best possible solutions looked roughly like square grids. An OpenAI model has now disproved that belief, discovering an entirely new family of constructions that performs better. This marks the first time AI has autonomously solved a prominent open problem central to a field of mathematics.











I can’t imagine there’s a button in existence that does less than this. Maybe the close door button on an elevator?



If you design/remodel a home too idiosyncratically to your own tastes It will be extremely challenging to sell later on, even in the blazing hot San Francisco real estate market of 2026



Yesterday I drove my @tesla 900 miles on FSD from Miami to Nashville and I realized it’s genuinely the better option. I fly that route 2 to 3 times a month. Flights are never under $400. Most times $600. Sometimes $800. Add Uber to and from both airports, or parking garage fees. Then factor in the delays, the cancellations, the security theater, the chaos, the guy next to you who hasn’t met deodorant yet. On the other hand: I pack healthy snacks, press one button, and the car just goes. I took calls. Replied to emails. FaceTimed my family. Ate without pulling over. Did everything I normally do on a travel day, except none of the stuff that makes travel days miserable. My biggest concern going in was range and charging. Here’s what actually happened: My bladder needed one extra stop the car didn’t even suggest. Most charging stops were under five minutes. Total cost for the whole trip was less than just the uber to the airport. And this was the base model Y. Now I’m thinking I should get something comfier and just make this the default.
