Look­ing for some fun–and free–cognitive stim­u­la­tion over the week­end? Here you have a few quick brain teasers to chal­lenge your atten­tion and your work­ing mem­ory (work­ing mem­ory is the capac­i­ty to keep infor­ma­tion in your mind while work­ing on pro­cess­ing and inte­grat­ing it) Please give them a try…they are not as easy as they may seem :-) 1. Say the days…