my weekend codex project people talk about zone exercise all the time but it's so tedious to keep your pulse exactly within range, given your heart rate is slow to react, noisy, and drifting over long sessions. still, i wanted to try, and so far the results are quite promising. i used polar h10 sensor and some treadmill that supports ftms. i reverse engineered the protocol and made an iphone app that connects to both devices and acts as a pid controller. your heart rate sets the pace, and the prediction algorithm tries to keep it within your desired zone, gently raising or lowering the speed, frontrunning a breakout. i chose first-order with a dead time as a model, because it takes a minute or two for your pulse to settle after adjusting the speed. it also usually raises faster than it falls.

Super intelligence warfare😅

True human creativity. Another great Apple ad.

there should be some “playing safe” lines that go down anyway

I've found myself in need of something like the Macro/Steam Deck with programmable buttons. I've sort of settled on a 5" touchscreen powered by a pi (need a dynamic-ish interface and custom button labels) and these interfaces are starting to feel more real.

English <-> Claudish

China now has 1.2 terawatts (TW) of solar capacity and built more solar in 2025 than the US has built in its entire history. The US needs to build more solar, and fast.

Coding is not an asset anymore

Greco-Deco data centers

The most important skills in Building and Deploying AI Applications.

Humans are the minority user of AI Agents burn nearly 5x the tokens people do, up 14x since February