on the other hand, is a mixture of deterministic and stochastic theories. Quantum mechanics predicts events only in terms of probabilities, casting doubt on whether the universe is deterministic at all, although evolution of the universal state vector is completely deterministic. Current physical theories cannot resolve the question of whether determinism is true of the world, being very far from a potential theory of everything, and open to many different interpretations. Assuming that an indeterministic interpretation of quantum mechanics is correct, one may still object that such indeterminism is for all practical purposes confined to microscopic phenomena. This is not always the case: many macroscopic phenomena are based on quantum effects. For instance, some hardware random number generators work by amplifying quantum effects into practically usable signals. A more significant question is whether the indeterminism of quantum mechanics allows for the traditional idea of free will (based on a perception of free will). If a person's action is, however, only a result of complete quantum randomness, mental processes as experienced have no influence on the probabilistic outcomes (such as volition). According to many interpretations, non-determinism enables free will to exist, while others assert the opposite (because the action was not controllable by the physical being who claims to possess the free will). Genetics Like physicists, biologists have frequently addressed questions related to free will. One of the most heated debates in biology is that of "nature versus nurture", concerning the relative importance of genetics and biology as compared to culture and environment in human behavior. The view of many researchers is that many human behaviors can be explained in terms of humans' brains, genes, and evolutionary histories. This point of view raises the fear that such attribution makes it impossible to hold others responsible for their actions. Steven Pinker's view is that fear of determinism in the context of "genetics" and "evolution" is a mistake, that it is "a confusion of explanation with exculpation". Responsibility does not require that behavior be uncaused, as long as behavior responds to praise and blame. Moreover, it is not certain that environmental determination is any less threatening to free will than genetic determination. Neuroscience and neurophilosophy It has become possible to study the living brain, and researchers can now watch the brain's decision-making process at work. A seminal experiment in this field was conducted by Benjamin Libet in the 1980s, in which he asked