Rocking synchronizes brain waves during a short nap

Correspondence expeditions. Indeed, even in 1993 Fiennes and Stroud needed to be picked up from an ice shelf before reaching its edge, having totally exhausted their energy reserves man-hauling across the Antarctic continent. Thus, even today, while technological advancements have engineered out certain weaknesses of the human condition, others remain as limiting factors that must be stretched to breaking point if explorers on foot are to return home alive from the South Pole.