Section 11 of the Indian Evidence Act discusses when facts not otherwise relevant can become relevant in legal cases. It provides two conditions: (1) if the facts are inconsistent with facts in issue or other relevant facts, or (2) if the facts alone or in connection with other facts make the existence or non-existence of a fact in issue highly probable or improbable. The document then provides examples of how facts could meet these conditions, such as establishing an alibi to show someone was elsewhere during a crime. It also discusses the burden of proof for establishing an alibi defense and considerations around the credibility of alibis.