. >> looking at that peerks watching it, i -- piece, just watching it, i feel that gave me a head ache>> rachelle, you have a background in neuroscience, what damage are we looking at with a big collision? >> that's interesting. there are thousands of researchers across the country trying to figure it out. some believe there's sheering happening at the ends of neuropathways so the connections between the different parts of the brain are weaker. peopler thinking that you get tears in the tissue which would weaken the structure and function. there's the idea of bruising and temporary damage through swelling. there's a lot. >> there's a lot. >> yes. and a lot of it is temporary. but some of it, you know, could be serious. >> i want my kids to watch. my 8-year-old want to play football. it's huge. i've been trying to explain to him the danger involved. as a mum it's hard for me to watch the shots of the impact. >> what will we see next? i imagine it's an interesting hat that you are putting on. >> next i put on what i deemed the science acto pus to look at -- octopus to look at my brain wa