“Quantum suicide” and “quantum immortality” get their name from this idea and that it may be impossible to die (from your own point of view), no matter how hard you try. Quantum immortality is a philosophical thought experiment about what happens when you combine quantum many-state-ness with the anthropic principle and survivorship bias. So this gives us a way of testing out the completely insane idea of quantum immortality. Quantum immortality is, almost by definition, a subjective experience. Clearly it’s possible to observe other people passing away (condolences everyone), but if quantum immortality is real, you’ll find out on your own.