This was a very well done piece, showing all facts and truth. To those who say Islam was "spread by the sword," well, what about Christianity and Judaism? This was a ruthless time, it wasn't exactly a love-all type of era. The only difference was, and this IS the truth, is that the Muslims showed respect when they did fight. Never tearing down religious places, fighting those who could defend themselves. And why nay-say something you haven't even investigated yourself? That's the disgusting thing, not this video. This isn't the only documentary or article to talk about how Muslims were humble during horrid times. And the facts about advances in knowledge are true as well. In fact, algebra was formed off of an Arabic book known as al jabr, written by an Arab scholar during this time. Do your homework.