this might be of interest

[Engineer1949]

www.youtube.com/watch?v=Sc9_MuvLleo&t=297s its all preety cool but at 11.51 is the dogs

enjoy

john

[Mr Cerbera]

Very Interesting John, Good Post (especially following the chain of vids that it led me on to )

[gruffalo]

Loved it thank you John!

[Jhonno]

Great link! Cheers for that..