http://www.maskedretriever.com/The science in this comic is very interesting. I love how he references tons of information sort of like how Narbonic did (mostly in second half).
I would rate it mature though, because pretty much the entire first half has a lot of adult behavior. The entire world is full of homo/hetero/bi/it/that/this/what////// people, and the story really revolves around this. The art is horrible until you drag your way through half way or so, and even then it isn't great. I actually haven't got too much good stuff to say about it, which is one of the reasons why it took me a year to put it on here. It's obvious that he gets bored following a storyline because it jumps here and there for those of us who have ADD.
Have I mentioned that it references tons of sci-fi stuff that's neat and interesting. Many a creative juices have flowed because of this comic.