What links petrol pump handles, handles on public postboxes, escalator rails, ATM buttons, parking meters and kiosks, pedestrian crossing buttons and buttons on vending machines? Answer here
What links petrol pump handles, handles on public postboxes, escalator rails, ATM buttons, parking meters and kiosks, pedestrian crossing buttons and buttons on vending machines? Answer here
How big is the world's smallest man made pump? (I was shocked!) Answer here