Since when have people needed to communicate?, Modern age, Middle Ages, Stone Age , 20th century, What did two columns of smoke mean to Native Americans?, Danger is coming, A celebration, A war party returned successfully, A meeting place, Why can only a few people understand the drum language?, It is very old, It is very loud, It is not used anymore, Only natives understand it , What was Tomlinson not thinking about when he sent his first message?, Making money, Starting a communication revolution, Teaching people, Writing a letter, How many email boxes were there by the end of the 20th century?, 100 million, 150 million, 200 million, 263 million .

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