Answer:
Johann Gutenberg's invention of movable-type printing quickened the spread of knowledge, discoveries, and literacy in Renaissance Europe.
This is more of a science question, but ok. You see blue light because in the color spectrum blue passes most easily through things. Hence why the sky is blue. Its the light from the sun filtered out and only blue passing all the way through the atmosphere.
Well they are the ones who made the social hierarchy. (Division of labor.)
Hitler broke the Munich Agreement following the Nazi invasion of Poland in 1939 signaling greater expansion of Nazi territorial acquisitions in Europe. This sparked the outbreak of World War II.
