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          This short book gives useful information about historical attempts to communicate with Aliens. There is discussion of the challenges of very-long-distance communication and of the theories of cognition and mathematics that may, or may not, be universal. Do Aliens even see or hear at the frequencies that we do? Even other scientists in the field have had small success in deciphering some of the messages that have been constructed and used in the past. There is a lot of nerdy discussion of algorithmic language, but there is also interesting coverage of the issues of METI (messaging extra terrestrial intelligences). Specific issues covered include "Shouting in the Jungle", "Is METI scientific?" the cost of transmissions, and "Who Speaks for Earth?" After you read this, its likely that you will have a new frame of reference on the topics and will want to talk over these issues with your family and friends.



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