Growing the Next Generation of Open Source Hackers

As a parent of three (children aged: 10, 7, and 5), I'm eager to share with my kids the values that attracted me to open source and the hacker ethos: sharing and building great things together, taking control of your environment, and embracing technology as a means of expression, rather than as media to be consumed. In other words: How can grown-up hackers ensure that we're growing the next generation of open source hackers?