Under per-second billing, the worst case is to shut down at the beginning of a second, with a highest possible cost for these same machines (sparing you the math) being about $0.02. So, the best this ...

More precisely, it should be able to detect every photon that hits it within 100 trillionths of a second, to as much as 1.5 billion of them per second – and that’s like counting individual ...