h1. What I Learned in February

h2. 2013 Feb 1

Red and green aren’t really good for making 3D images. “There’s Something About Yellow”:http://www.paulvanslembrouck.com/2011/theres-something-about-yellow/

h2. 2013 Feb 2

“f/stops”:http://www.uscoles.com/fstop.htm The “f/stop” is the ratio of the focal length to diameter. Each f/stop “down” halves the amount of light going through. So, f/8->f/11 is halving the amount of light. f/11->f/8 is doubling the amount of light. Small f/stop number, more light. Large f/stop number, less light.

h2. 2013 Feb 8

I sort of already knew this, but…

CGI scripts should define a Content-Type header. A perl cgi script I was using was returning “Premature end of script headers”. Looks like a proper CGI script should be returning some kind of Content-Type header.

h2. 2013 Feb 14

To get the hosts file in Windows 7 really fast, just open the Run prompt and type “drivers”. Ta-da! (Thanks, Mukta :)