Ever tried to build something, even something simple, say a toaster, from scratch? Well this guy did, while he failed in his attempt, it was a pretty fun ride. And it shows just how interconnected and interdependent we all are, on each other.
And after seeing that, see this next one. Subtly related to the last one, it discusses how innovation (from which we derive specialization) often appears from diversity: from the interchange, and indeed the interbreeding, of ideas.