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How to set your Acer C720 Chromebook to boot to Ubuntu by default.
Place your closed laptop on a soft surface, upside down.
Use a sharp knife to cut a hole in the warranty sticker (YES THIS WILL VOID THE WARRANTY).
Remove the 13 screws with a small phillips head screwdriver (PH1 size works well). Be careful, the screws are very small and will strip easily if you use the wrong size screwdriver.
Remove the bottom of the laptop by pulling up on it near the hinges. It takes a bit of pressure to remove, but if you lift it from the back (near the hinges) the same way you would open a laptop screen, the hooks won't break (even though they will make a loud snapping sound).
Remove the BIOS write-protect screw. It is labeled as #7 in this image
With the bottom off, turn over the laptop and open the screen.
This article has been given a more permanent home on my blog. Also, since it was first written, the development of the Promises/A+ specification has made the original emphasis on Promises/A seem somewhat outdated.
You're Missing the Point of Promises
Promises are a software abstraction that makes working with asynchronous operations much more pleasant. In the most
basic definition, your code will move from continuation-passing style:
getTweetsFor("domenic",function(err,results){// the rest of your code goes here.
