Travelling is an education in itself — few things are more intellectually stimulating than planning precise routes, finding affordable tickets and accommodation, meeting new people and immersing yourself in unfamiliar cultures. But during a long-term sabbatical, fatigue can set in after a while, which sparks a mental slump for some adventurers that means they might not be feeling as focused and fresh as usual. Fear not — these five ways to brain train while travelling will keep you feeling sharp as a tack and brilliantly on the ball. Rubik’s Cube The Rubik’s Cube was invented in 1974 by Hungarian architect Erno Rubik, who originally envisioned it as an educational model for explaining three-dimensional geometry. It’s since become a favourite brain-teaser for millions of brainboxes worldwide and because it’s so compact, is the ideal travel companion for tuning up your spatial skills and manual dexterity. If you’re tempted to take up this challenging hobby again, pop a cube in a corner of your rucksack and play with it. I have seen a lot of travelers travelling …