Pick any great expedition in history and somewhere in the story, usually tucked away in a footnote, you'll find the moment the team nearly fell apart. Not because of a storm or a broken compass, but because two people couldn't stand each other, or the pressure became unbearable, or exhaustion turned small irritations into serious conflicts. Ernest Shackleton understood this. He reportedly selected crew members partly on the basis of their ability to get along. He knew that on the ice, personality could matter as much as skill. NASA already does this in their astronaut selection but are now thinking more like Shackleton as it plans a permanent base on the Moon. The Artemis programme aims to put astronauts back on the lunar surface within this decade, not just for a brief visit, but to stay. A sustained human presence on the Moon means small teams of people living and working together in an extreme, unforgiving environment, cut off from immediate help, for months at a time and in relatively close proximity.…