This will test you knowledge of WT history ... what do all the following items have in common:
Adding Machines
Aeroplanes
Aluminum
Artificial Dyes
Automobiles
Barbed Wire
Bicycles
Darkest Africa
Electric Railways
Escalators
Dynamite
Motion Pictures
North Pole
Panama Canal
Railway Signals
South Pole
Submarines
Sky Scrapers
Subways
Telephones
Typewriters
Vacuum Cleaners
I've left a few off so if you know the answer you can perhaps just add one of the missing items to show you know without revealing it straight away