“Quantum immortality is one of the scariest ideas imaginable,” says Oxford’s Sandberg. The topic has even become something of a taboo among physicists who think its widespread dissemination might encourage an amateur physicist with the courage of their convictions to try their hand at Russian roulette.
“The guy trying out [Russian roulette] will, from the perspective of most observers, just be dead,” says Sandberg. “Of course, there are a few, very rare observers that see him being very, very lucky. But as he keeps on doing this that set is getting smaller and smaller. But it always includes a version of himself.”