There is also the related claim that the selection criteria for the low-energy limit must not come from the model, but by realizing that the fundamental constants may have the values they have not for fundamental physical reasons, but rather because such values are necessary for life. Its proponents not only claim that the lack of predictability of string theory is not a shortcoming. This approach seems to reinterpret the role and function of scientific knowledge in a quite radical way. We concentrate in this paper on the so-called anthropic landscape scenario. A heated scientific debate is ongoing as to the actual status of string theory in the light of these developments. In the absence of a mechanism to select which one of these vacua corresponds to the real world, the theory seems to lose any predictive capability and even its scientific status, reducing to a bright mathematical game. Research in the last years, though, has shown that string theory possesses a huge number of false vacua (the string landscape). It provides a way to avoid infinities in the treatment of gravity and it was thought to produce a limited number of interrelated consistent theories, the low-energy limit of which would give the known particles and masses of our physical world. It has been touted as a way to reconcile (and supersede) the two most successful (but mutually incompatible) theories in modern physics, General Relativity and the Standard Model. String theory is a promising approach to achieve unification of all known fundamental interactions.
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