Can anyone help.me search out and find a documentary? It was a while ago on TV, no idea which channel. It was about the earths core composition and there was five ish separate scientists working on separate things ( lab created diamonds, measuring earthquakes from the other side of the world to the qake etc). I was explaining to my son about how you prove science without drilling to earths core. I have googled it on and off for years but can't find it.
I know, very geeky