Did you know that the ocean is around 180m higher off Australia than it is around Sri Lanka. This is incredible. Why doesn’t the water flow towards Sri Lanka then? It all got to do with gravity, and how it is varies across the globe. This explanation is brilliant, and I guarantee that after 2 minutes and 45 seconds, you will know a lot more about the world*.
In general I’m quite a fan of Minute Physics, it explains some pretty complex ideas simply and easily. Check it out.
*unless of course, you’re a geophysicist and you know all this stuff already, but even so, its a cool video, and probably the best way of explaining to your Gran exactly what it is you do again.