Can you explain an aspect of our world in motion in 30 seconds? My friend and fellow PhDer Gina Maffey can..
If you enjoy the video, please 'like' it on youtube to help support her in the British Science Assiciation's Prove It! competition.
It was filmed on Aberdeen beach. You can find more about Gina here and she is on twitter @ginazoo and is also part of the Au Science Magazine team :-)
This competition was set for National Science and Engineering week and is open for anyone to submit an entry!