The human hand has more nerve endings per square centimeter than almost any other part of the body. It is the primary tool through which humans interact with the physical world, the instrument of creation, combat, comfort, and connection. Evolutionarily, the condition and movement of the hands signaled critical information about intent: open hands approaching meant no weapon, no threat. Closed hands, hidden hands, or hands reaching toward a weapon triggered immediate threat assessment. These ancient reading mechanisms are still active in every human brain, processing hand signals far below conscious awareness and influencing how we evaluate credibility, trustworthiness, and...