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The day the light bulb was invented – level 3
21-10-1879The first experiments with electric light were carried out in the...
The day of the Smolensk air disaster – level 2
10-04-2010On April 10, 2010, a Polish plane was flying to Russia....
The day of the Smolensk air disaster – level 3
10-04-2010On April 10, 2010, a Polish government plane headed to Russia...
