Forget the Wheel, Forget the mobile phone!!
The single most amazing human achievement was fitting a toilet to a coach <!-- s:D --><img src="{SMILIES_PATH}/icon_biggrin.gif" alt="

" title="Very Happy" /><!-- s:D -->
In the "good the old days" 48 of us used to travel from Manchester to Northern Scotland for sea fishing armed with a skin full inside, crates on the coach and the only comfort stop we had was a 25 liter jerry can!!
Ahhhh! I can still smell it now
Will