【明報專訊】Hands are adventurers. Whatever we venture into, our hands volunteer to fathom the danger, figure out possibilities, and complete the tasks. As time goes by, they archive our activities more accurately than the latest biometric technology would permit. If Sherlock Holmes lived in our age, a squeeze on someone's hands would reveal more than a thousand words. Calluses around the bottom of the fingers? The person could be a climber. Numb fingertips? Possibly a guitarist. Irregular cuts everywhere? Potentially a chef. All of the above with some scars and blisters? Probably moms or domestic helpers who shoulder an impossible list of household chores.