Someone asked me this week: "What are some examples of open source software that most non-technical people have heard of?" I had a few answers off the top of my head, but not nearly enough. Anyone that uses a computer likely interacts with hundreds of open source components every day.
I stumbled across this great open source basics video while preparing some materials for the GitHub sales team. It gives a pretty good introduction to open source by comparing it to a family cookie recipe.
Be careful what you tell yourself, because you will believe the lies, and so will everyone else.
Create junk drawers; for things, for ideas, for time, for relationships. Make space for things that don't fit in. Let all the things that don't belong gather in one place. You may be surprised at what emerges to demand its own place.
The web lives and dies by the DOM. It is both a beautiful and horrible thing. Here is just one example; it's called "DOM clobbering".