This is because Fahrenheit is based on a brine scale and the human body. The scale is basically how cold does it have to be to freeze saltwater (zero Fahrenheit) to what temperature is the human body (100-ish Fahrenheit, although now we know that’s not exactly accurate). Fahrenheit was designed around humans.

Celsius and Kelvin are designed around the natural world.

Celsius is a scale based on water. Zero is when water freezes, 100 is when water boils.

Kelvin uses the same scale as Celsius (one degree, as a unit, is the same between the two), but defines zero as absolute zero, which is basically the temperature at which atoms literally stop doing that spinning thing. Nothing can exist below zero Kelvin. It’s the bottom of the scale.

So.

Fahrenheit: what temperatures affect humans

Celsius: what temperatures affect water

Kelvin: what temperatures affect atoms

I’m giving an Ignite talk for the first time at DevOps days Paris. It’s an interesting format: a 5-minute talk with 20 auto-advancing slides, every 15 seconds. I found How to Give a great Ignite Talk by Scott Berkun very useful, including the accompanying video.

via http://www.studiopress.com/design/google-font-combinations.htm

I’m giving an Ignite talk for the first time at DevOps days Paris. It’s an interesting format: a 5-minute talk with 20 auto-advancing slides, every 15 seconds. I found How to Give a great Ignite Talk by Scott Berkun very useful, including the accompanying video.

About a year ago, Posterous was acquired by Twitter. A month ago, it was announced that it will be completely shut down by April 30th. I’ll spare you my rant about how the awesome customer service that characterized Posterous pre-acquisition completely disappeared after the acquisition :)

On a more practical note, Posterous’ closing meant finding a new place to host my blogs. There are many options (you can find many of them described in the posthaven.com migration guide), but I decided to go the DIY way and move my blogs to Octopress, hosted on GitHub Pages.