This guy sure knows his facts. You need some good mathematical understanding (geometry in particular).
He's uploaded 17 videos; this is just one.
I'm amazed by his logic and reasoning and the painstaking research- and they're great as there's no sensationalism - just the truth beautifully and factually presented.
I've subscribed to his channel and intend to learn more. This was recommended to me from a friend in Iowa. 
Susan x


Check out this video on YouTube:

http://www.youtube.com/watch?v=UiovbXTAaiE&feature=youtube_gdata_player