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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