BS: No I've seen the Pushes and Pulls one but [It's pretty similar]
AS: [Ok. yeah] where the two students push each other and they both go backwards. And you know I think that's quite a hard thing to understand that, for every - action there's an equal and opposite reaction. I certainly - you know I (don't) think it's very obvious or - maybe it is, it's just not to me I don't think I'm - I don't think like that at all. And so - actually to - go away, you know you can read that in a book 10 times and not - and think - and not really get to grips with it. But I think to actually see an example of that you know. And that's a really - I think that's a really - visual example. And particularly - I was going to say particularly for the two children who are sitting on - on the chairs but I think it's more than that you know. There's these these big - pieces of demo equipment which are showing something that is is - basically integral to the way, you know, it's fundamental to to physics I think, or to certainly that branch of physics. I don't know. I've only got O-level physics. I'm not really good at it ((laughs)).