What’s the largest number we can really comprehend? It’s smaller than you think

This guy is awesome! http://www.youtube.com/watch?v=AOsXjYKvCZ8 I think I've mentioned before that we don't really understand the very large and very small, we just equate it with metaphors of our "normal" scale existence.  Nick Lucid gives one of the reasons why.  Without abstract frameworks, we can't really do numbers. BTW, he has a Tumblr site.