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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 of the Chernobyl disaster – level 3
26-04-1986The Chernobyl nuclear power plant was located 100 kilometers from Kyiv,...
The day the Hubble Space Telescope was taken to space – level 1
24-04-1990It is April 24, 1990. The Hubble Space Telescope goes to...
The day the Hubble Space Telescope was taken to space – level 2
24-04-1990On April 24, 1990, the Hubble Space Telescope was taken to...
The day the Hubble Space Telescope was taken to space – level 3
24-04-1990On April 24, 1990, a spacecraft took off from Florida. It...
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...
