Al Fadi and Dr. Jay continue to discuss the problem with the sources(Sira, hadith,...). They are questioning the Standard Islamic Narrative(S.I.N.).  They ask the question how do we know that it is true? Going back to the time when the people who wrote the sources lived and died ; they find a gap in the timeline. For example, there is a 200 year gap between the death of Mohammad and the death of Ibn Hisham; who wrote the Sira(Biography) of Mohammad; therefore he was not an eyewitness.