What did johann gutenberg invent in the 15th century that led to the spread of ideas including the reformation?
a) paper
b) astrolab
c) steam engine
d) printing press

f 5 , h

chronological thinking is an indispensable tool to structure a historical narrative and to give meaning to a sequence of events. the final section presents the results of a survey to test the chronological thinking of lower secondary school students carried out by the educational research institute.