The activity in different parts of their brains also became more synchronised. Their low-gamma waves, in particular, became twice as synchronised when they were in their near-death state than when they were anaesthetised or awake. These features have been linked to conscious perception in earlier studies.
Tug of war is a sport that directly puts two teams against each other in a test of strength: teams pull on opposite ends of a rope, with the goal being to bring the rope a certain distance in one direction against the force of the opposing team's pull.
At sea, the Civil War was a global, if low-level war. Confederate raiders attacked Union shipping all over the globe. Under the rules of naval warfare, a captured merchant vessel could be sold to finance the war effort, converted to a fighting ship, or sunk if no other alternative were available.