Hi all, I've been struggling with Mathematica on a Raspberry Pi for a couple or three years and I'd like to know more about how it works to figure out why. I'm using a Pi as it was a cheap start, it's also brought the missing fun back into computers so I'm sticking with it. My first problem was that beyond working as four function calculator, it wouldn't work without WiFi; so I had to buy a dongle. Specifically it was factorials that bombed. This raises the question of does it work locally or in the cloud and when? Second was timeouts, I keep writing code that needs days to run, sometimes for three weeks. Once I solved the power integrity, it took ages to learn that the code was not completing. I suspected maybe it was running in the cloud somewhere. Is that so? Third, and last for now; I thought I'd try clusters and after days of work got a cluster going. However, I have no way of working out if it is being used by Mathematica, or if I have to change my code. In fact, so far; I can't even tell if the internal bench marking tool will work on a cluster. I've learned it won't run on any Pi with 512 MB of RAM, and that it is 6 times since I started with V10. But how do I use a cluster, and how do I tell if it is contributing? Thanks to those who can help, David