Snacks and water are sold as switches for concentration. This feature reads the evidence on breakfast, glycaemic load, meal size and mild dehydration, and separates what changes attention from what only feels as if it should.

Five minutes, one page, one chapter. Mind-Map Any Chapter fixes the map at a centre in six words, three branches and six twigs, then asks you to redraw the skeleton from memory. The UNOP guide teaches the full method; this is the version that fits between two classes and still leaves you a revision sheet you can trust.

Focused work ends at a boundary, and what you do next decides whether the block holds. Switch to Diffuse Mode is a two-minute exit from input: stop at the timer, park the task in one line, stand up, let the mind wander with nothing to solve, then return and capture what surfaced. The UNOP study guide sets five to ten minutes for a full diffuse window. Two minutes is the floor that keeps the habit alive.