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The day of the Chernobyl disaster – level 1
26-04-1986Chernobyl is in Ukraine. There is a nuclear power plant in...
The day of the Chernobyl disaster – level 2
26-04-1986The Chernobyl nuclear power plant was located 100 kilometers from Kyiv...
The day HIV was discovered – level 1
23-04-1984In 1981, five men from Los Angeles have a strange disease....
The day HIV was discovered – level 2
23-04-1984In 1981, doctors found that five men from Los Angeles had...
The day HIV was discovered – level 3
23-04-1984In 1981, five men from Los Angeles were reported to have...
The day Deepwater Horizon sank – level 1
22-04-2010Deepwater Horizon is a modern rig. The rig takes oil from...
The day Deepwater Horizon sank – level 3
22-04-2010Deepwater Horizon was a modern oil drilling rig located in the...
The day Deepwater Horizon sank – level 2
22-04-2010Deepwater Horizon was a modern oil rig. It took oil from...
The day Leonardo Da Vinci was born – level 2
15-04-1452Leonardo da Vinci was born on April 15, 1452, into a...
The day Leonardo Da Vinci was born – level 3
15-04-1452Leonardo da Vinci was born on April 15, 1452, into a...