When Scott took a fifth man with him to the South Pole he signed each man’s death warrants. Not for the first time, Scott’s endless calculations for four men – pages and pages of scribbled notes on weights and distances and food and cooking fuel to carry – proved to be a waste of time. His surgeon had already warned him he’d calculated too little food per day for manhauling a sled. What’s more they only had four pairs of skis. They’d have to take it in turns to walk.

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