The third generation of Lego's best-selling programmable robotics platform is here, and features more sensors, motors, and flexibility than ever. Plus mobile apps.

The Lego WeDo system also has available software to program the robots, an activity pack to guide learning and an excellent guide for teachers to facilitate teaching.

Not only can you search their database for nearly 8,000 instruction books to existing sets, but you can also see custom builds by Lego experts and download instructions to build them yourself.

This year at CES, Lego is bridging the gap with Boost, a basic robotics- and programming-oriented kit that’s supposed to be more playful than didactic.

Some great Labor Day promotions on the LEGO Store, but they're only available for Insiders (you can sign up for free).