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The day the first public TV started – level 2

02-11-1936

It is 1936 and there is a big competition in Britain....



The day the first public TV started – level 3

02-11-1936

It is 1936 and a big competition is culminating in Britain....



The day GPS was fully operational – level 2

17-07-1995

The Global Positioning System (GPS) is a satellite system which gives...



The day GPS was fully operational – level 3

17-07-1995

The Global Positioning System (GPS) is a satellite system that provides...