Printing press: http://theconversation.com/five-of-the-most-violent-moments-of-the-reformation-71535 http://theconversation.com/five-of-the-most-violent-moments

Printing press: http://theconversation.com/five-of-the-most-violent-moments-of-the-reformation-71535 http://theconversation.com/five-of-the-most-violent-moments-... Radio: https://en.wikipedia.org/wiki/Radio_propaganda https://en.wikipedia.org/wiki/Radio_propaganda