As an add: I spend quite some time in the steam room, which has the added property of not being friendly to technical devices. What I do so far is to prep my memory system, and to think about single issues for a while. But I am happy to collect more suggestions, maybe a few from here are suitable for that too like mental arithmetics.
As an add: I spend quite some time in the steam room, which has the added property of not being friendly to technical devices. What I do so far is to prep my memory system, and to think about single issues for a while. But I am happy to collect more suggestions, maybe a few from here are suitable for that too like mental arithmetics.