Forethought’s @TomDavidsonX says AI labs could almost mathematically calculate whether a software-only singularity is coming, but they're the only ones with the data to know: "The hardware loop is gonna be slow. Building fabs takes years. The scariest thing is that maybe even without the hardware loop, that's by itself enough to explode, and that is the thing which scarily is actually pretty plausible." "The most important thing in the world right now is just the AI companies measuring their…