The Minimum Mass of the First Stars and the Anthropic Principle
  The lower limit of the mass of the first stars suggested recently may imply the formation of massive stars of mass greater than 8 solar mass irrespective of the details of the initial mass function. The production of heavy metals from the first stars will ensure a requisite for the existence of life without the anthropic principle. 
Takashi Nakamura, Hideya Uehara, and Takeshi Chiba