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The day the first public TV started – level 2
02-11-1936It is 1936 and there is a big competition in Britain....
The day the first public TV started – level 3
02-11-1936It is 1936 and a big competition is culminating in Britain....
The day GPS was fully operational – level 2
17-07-1995The Global Positioning System (GPS) is a satellite system which gives...
The day GPS was fully operational – level 3
17-07-1995The Global Positioning System (GPS) is a satellite system that provides...
