Lies ?

I watched a PBS documentary about the Islamic Empires last night- on several occasions they whitewashed and distorted history. First, when the story of Mohammed was presented, the fact that his wife was fifteen years older than him was carefully omitted- i feel this is important, as it gives clues about the psychology involved. Next, as the Moslems conquered central Asia, it was reported that they encountered 'Paper' and thus made it available to the world. The Chinese invented paper, but it was reported in such a way to make it look like maybe the Moslems did. Then, it was related that the Arabs devised the checking system, but my understanding is that it was the Knights Templars who first came up with credit and checking.....
History use to be rewritten about once a generation, now it seems like it is being rewritten every ten years or so....