Alt-week 09.07.13: 3D printed cars, invisibility cloaks, and LADEE launches

Alt-week takes a look at the best science and alternative tech stories from the last seven days. We're all about the launches this week, at both ends of the spectrum. At the small-scale, we see what happens when a pinewood derby gets the 3D printing treatment. At the other end, NASA's LADEE begins its voyage to the moon. This is alt-week.