Speaking of sandbox testing, here in New Zealand we have a lot of beaches with black iron sand. It’s very fine and gets absolutely everywhere. A layer is often

Speaking of sandbox testing, here in New Zealand we have a lot of beaches with black iron sand. It’s very fine and gets absolutely everywhere. A layer is often in beachside houses. You see it in the toilets, it’s in cars, in electronics near beaches, it’s in your hair days later. It’s stuck inside MRI scanners around town (I work with them). A finer dust would be a nightmare, as iron sand is bad enough.