Szymon Rączka

there will be a blog post about this. on what this means for bun, benchmarks, memory usage, maintainability going forward, and also the literal process of doing this (it wasn’t just “claude, rewrite bun in rust. make no mistakes”) this is a 960,000 LOC rewrite, the code truly works, passing the test suite on Linux and soon other platforms. e2e I started working on this 6 days ago. this would’ve been a massive amount of work by hand.

Drink your coffee! Drinking two cups of coffee makes your brain better at hitting its own brake pedal, specifically, the mechanism that quiets motor signals when sensory input arrives. Researchers at Campus Bio-Medico in Rome gave people caffeine gum and then zapped their brains with TMS, and found the sensory "shush" effect on the motor cortex got stronger, peaking at a very narrow 19–21ms timing window. If you show up to a neurological exam caffeinated, your brain's inhibitory readouts look artificially healthy. That's a real problem for conditions like Alzheimer's and Parkinson's, where weakened sensory-motor inhibition is one of the key markers doctors look for. Caffeine essentially mimics the cholinergic signaling those diseases destroy, so it could literally mask early signs of cognitive decline on a test. Also interesting: the effect only showed up with one of the two measurement methods, which the authors think is because stronger magnetic pulses recruit deeper cortical circuits that caffeine specifically modulates. The weaker-pulse protocol missed it entirely. Says a lot about how methodology choices can make or break what you find in neuroscience.

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