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The day the Roswell UFO incident was published – level 2
08-07-1947One morning in July 1947, a farmer who worked on the...
The day the Roswell UFO incident was published – level 3
08-07-1947One morning in July 1947, William Brazel who worked on the...
The day the longest bridge was opened – level 1
30-06-2011The Danyang-Kunshan Grand Bridge is in China. The bridge opens on...
The day the longest bridge was opened – level 2
30-06-2011The Danyang-Kunshan Grand Bridge is in China. The bridge was officially...
The day the longest bridge was opened – level 3
30-06-2011The Danyang-Kunshan Grand Bridge, located in China, was officially opened to...
The day the bicycle was invented – level 1
12-06-1817The first bicycle is made in Germany on June 12, 1817....
The day the bicycle was invented – level 2
12-06-1817The invention of the bicycle was a long process. It was...
The day the bicycle was invented – level 3
12-06-1817The invention of the bicycle was a gradual process that took...
The day the longest railway tunnel was opened – level 1
01-06-2001The longest railway tunnel in the world is in Switzerland. The...
The day the longest railway tunnel was opened – level 2
01-06-2001The longest railway tunnel in the world is in Switzerland. Its...
