We've seen a lot of homemade chain reaction videos, or Rube Goldberg machines, and they never fail to impress us. But you will be more impressed when you see how many things can go wrong in designing and building these contraptions.
In a process designed to work on its own, human intervention is necessary at many points to keep the whole thing on track. There's probably a lesson in there somewhere, but everyone is too busy laughing to catch it.
The title is a joke; this is not a group of Boeing engineers, it's a meeting of educators in Denmark. Why they are speaking English is unknown; maybe they traveled for a conference. The point is that the chain reactions you see that go exactly the way they are supposed to are the result of a lot of hard work, in which every element is tested over and over. What you see here is the result of committees that hope to network with other committees while rushing the product to a public demonstration long before it's ready. A good time was had by all. -via reddit