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The day HIV was discovered – level 3
23-04-1984In 1981, five men from Los Angeles were reported to have...
The day the telephone was patented – level 3
07-03-1876Since 1873, Alexander Graham Bell was trying to find a way...
The day the first satellite was launched – level 2
04-10-1957Sputnik was one of the most famous objects which people made....
The day the first satellite was launched – level 3
04-10-1957It was one of the most famous objects ever created by...
The day the first undersea cable was laid across the Atlantic – level 3
05-08-1858The first undersea telegraph cable was laid across the Atlantic on...
The day GPS was fully operational – level 3
17-07-1995The Global Positioning System (GPS) is a satellite system that provides...
