Physicist and writer Philip Ball, a critic of the many-worlds interpretation, in his book "Beyond Weird" describes the quantum suicide experiment, as "cognitively unstable" and exemplificatory of the difficulties of the many-worlds theory with probabilities. While he acknowledges Lev Vaidman's argument that an experimenter should subjectively expect outcomes in proportion of the "measure of existence" of the worlds in which they happen, Ball ultimately rejects this explanation. "What this boils down to is the interpretation of probabilities in the MWI. If all outcomes occur with 100% probability, where does that leave the probabilistic character of quantum mechanics?" Furthermore, Ball explains that such arguments highlight what he recognizes as another major problem of the many-world interpretation, connected but independent from the issue of probability: the incompatibility with the notion of selfhood. Ball ascribes most attempts of justifying probabilities in the many-worlds interpretation to "saying that quantum probabilities are just what quantum mechanics look like "when consciousness is restricted to only one world"" but that "there is in fact no meaningful way to explain or justify such a restriction." Before performing a quantum measurement, an "Alice Before" experimenter "can't use quantum mechanics to predict what will happen to her in a way that can be articulated - because there is no logical way to talk about 'her' at any moment except the conscious present (which, in a frantically splitting universe, doesn't exist). Because it is logically impossible to connect the perceptions of Alice Before to Alice After experiment, "Alice" has disappeared. [...] MWI eliminates any coherent notion of what we can experience, or have experienced, or are experiencing right now."