The opening paragraph is word-by-word copied from Wikipedia. http://en.wikipedia.org/wiki/Visual_angle. Isn't that plagiarism? (Or is there some kind of rule that makes it okay?) TheTM™ 23:09, March 8, 2011 (UTC)

In developing the structure of this site, as is made clear in the Main Page, we have used the material from Wikipedia as placeholders. Do feel free to improve the material where you can. All Wikipedia writing, as is the material on this site, is published under a licence which makes it freely usable elswhere as long as suitable acknowledgement is given. This is usually done at the foot of each article copied.Dr Joe Kiff 23:41, March 8, 2011 (UTC)

Okay. Nice Wiki. TheTM™ 01:25, March 9, 2011 (UTC)