This week, we had two powerful reminders of how we’ve renewed American leadership in the world. I was proud to announce that—as promised—the rest of our troops in Iraq will come home
Now, Arduino itself is made of a lot of different open-source components 目前，Arduino包含很多不同的开源组件， that maybe individually are hard to use for a 12-year-old kid, 这些组件拆开来对于一个12岁的孩子使用起来太难了， so Arduino wrap
