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The day a signal came from space – level 1
15-08-1977It is August 15, 1977. An American astronomer looks at the...
The day a signal came from space – level 2
15-08-1977On August 15, 1977, American astronomer Jerry Ehman looked at the...
The day a signal came from space – level 3
15-08-1977On August 15, 1977, American astronomer Jerry Ehman carried out an...
The day the Panama Canal opened – level 1
15-08-1914Panama is a country in Central America. People want to build...
The day the Panama Canal opened – level 2
15-08-1914The first idea of building a canal between the Atlantic and...
The day the Panama Canal opened – level 3
15-08-1914The first idea to dig a canal between the Atlantic and...
The day the construction of the Tower of Pisa started – level 1
09-08-1173The Tower of Pisa stands in Italy. People start to build...
The day the construction of the Tower of Pisa started – level 2
09-08-1173The construction of the Tower of Pisa began on August 9,...
