Scientist Carl Sagan, who spent his life learning about and then sharing information on the Universe, was once asked what he thought was the greatest invention that mankind has had in its search for understanding the Cosmos.
His answer: "Writing." When asked why he chose that, he replied, "Because writing is perhaps the greatest of human inventions, binding together people who never knew each other; citizens of distant epochs. Books break the shackles of time. A book is proof that humans are capable of working magic."