I like it!
Like many on this forum I've learned a lot from your posts and wished you would share more of what you know. This is a step in that direction, so bravo!
As to constructive criticism: Add more graphics! When you are discussing the differences between paper cranes and airplanes, why not add pictures of the two? Same with proteins and amino acids and so forth? Right now you have one picture at the top and then a bunch of text. I think adding some more pictures would break up the block of text and would make it more appealing. Now, that's only my opinion, and it's worth exactly as much as I charged you for it!
Great start and I'm looking to read more...