It was about things we cant actually see because they happen so quickly. But with the use of high speed cameras and lots of technology we can now see it, slowed right down. They did loadsa of interesting stuff.
The best bit was an explsion they did with a few tonnes of gunpowder. They replayed it really slowly and you can see the shockwave ripple through the air. They showed lighnting which was incredible. When they slowed it down some of the lightning went from the ground upwards! Then triggered a load more lighntning downwards. Mental .
Also they caught "sprites" which have never been caught on camera before. Its basically a lightning bolt that is massive. Happens so quickly it will never be seen by our eyes. Its a flash of light that is about half a mile wide and a few miles high. It dwarfs everythng but happens so quickly.
They also did wildlife flying in slow motion and other stuff like that. Was really really interesting, I would recommend seeing it.