Part 3/10:
Imagine a man seated in front of a gun poised at his head, connected to a quantum measurement device. Each time he pulls the trigger, the state of a quantum particle is measured. If it's spinning clockwise, the gun fires; if counterclockwise, it clicks and remains unfired.
As the man pulls the trigger repeatedly, he experiences nothing but clicks—he continues to live. This behavior continues indefinitely, proposing a scenario in which the man becomes "immortal" in this particular universe. However, if at some point he pulls the trigger and the particle is measured in a clockwise direction, the gun fires, and he dies.