One of the great unanswered questions of science is why the laws of the universe seem so carefully tuned to allow for the existence of stars, galaxies, even humans. Scientists, philosophers and theologians have long mulled over this mystery. In this 15-minute episode of Subatomic Stories, Fermilab scientist Don Lincoln talks about the multiverse, which is a highly speculative possible answer to the question.

Scientist Don Lincoln explains how the existence of a multiverse is a possible answer to the question of why the universe seems so well-tuned for human life.