I spend much of my time doing calculations that are not too taxing on a modern computer. I set them up, start them, and work on something else for anywhere from a few seconds to half an hour, then come back to look at the answers. At least, that's what usually happens. Some days I mis-estimate what is small, and halfway through the calculation my machine comes to a grinding halt as my tiny computation eats all the available memory.

Today seems to be one of those days.