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The 1960s was an extraordinary time for the United States. Unburdened by post-war reparations, Americans were preoccupied with other developments like NASA, the game-changing space programme that put Neil Armstrong on the moon. Yet it was astronauts like Eugene Cernan who paved the uneven, perilous path to lunar exploration. A test pilot who lived to court danger, he was recrui...。Nature documentaries presenter Liz Bonnin shows the various tactics animals use to survive in some of the coldest places on Earth.。