To bring out the correct colour at each pixel, the temperature and exposure to the heater element is precisely controlled. The crystals in the top yellow layer require the highest temperature and shortest time to melt and become coloured; the magenta middle layer a lower temperature and longer time; and the bottom cyan layer the lowest temperatures and longest exposure time

[via NewSientistTech]

(click the image for the full size)

Alexa hasn’t always been the best indicator of traffic, but it’s pretty good for a quick snapshot and it is very handy when I’m looking at another site and want to know how they’re doing. For a long time, the Alexa stats pages have been the same. Not any more. I noticed this morning that Alexa changed the “Reach” to display as a percentage of the world’s web browsing population, which is much better than just guesstimating. Further down the page, they added geographic information. I am liking it so far. It won’t drag me away from Google Analytics, but it’s a step up.

Now I’m just wondering if more is on the way.