Uh oh, be careful kids, you just might learn something during summer vacation. 

A friend of mine posted this video on Facebook and my first thought was that this is a pretty cool demonstration on how topography works.  I wish they had something like this when I was a kid.

According to the video, this topography model was developed at UCLA to be able to effectively teach us about how the land works and what would be the likely outcome of different land changing scenarios.

Ok, maybe it sounds a little nerdy, but take a moment to check out the video.