Comment: No serif fonts (Score 1) 87
Tried it out, and the only problem is that there are no serif fonts for the pdf versions. While I can understand sans-serif for screen use, paper really needs a serif font.
Actually, the Hubble mirror isn't supposed to be flat, its shape is a particular function. It was actually manufactured exactly to spec, but the spec was wrong.
Actually,the hubble was spec'd to be a conic constant of p=-.0023, but was polished only to p=-.0139 (i.e. over hyperbolic). The error was due to a problem with the tester. The null reference element was out of position by just over a millimeter. The interesting thing is two other testers reported that the mirror was wrong, but they were ignored because they were not the 'primary' testing instrument. You are correct that it wasn't supposed to be flat, but it definitely wan't built to spec.
"If the code and the comments disagree, then both are probably wrong." -- Norm Schryer