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These events usually remove pieces of human knowledge and sometimes entire cultures. Today, many of the world's languages are in danger.
Furthermore, hundreds of websites are closed every day on the Internet; the average life of a web page is only 77 days. Those websites are used in many cases as references, but while projects such as the Internet Archive or WebCitation and volunteer groups like Archive Team save copies of some of them, many others are lost forever.
Wikipedia and its sister projects can and must save all these forms of knowledge, through creating articles, uploading images to Wikimedia Commons, preserving languages in Wiktionary and transcribing books into Wikisource. Events like Wiki Loves Monuments may help to immortalize monuments around the world before they are damaged or destroyed, but the 2011 edition only covers European countries.
There is a deadline. This is a battle against time.