With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Wikipedia articles cover many different vital topics.
text_B: Wikipedia -LRB- -LSB- wɪkiˈpiːdiə -RSB- -RRB- is a free online encyclopedia with the aim to allow anyone to edit articles .. online encyclopedia. online encyclopedia. Wikipedia is the largest and most popular general reference work on the Internet and is ranked among the ten most popular websites .. reference work. reference work. Wikipedia is owned by the nonprofit Wikimedia Foundation .. Wikimedia Foundation. Wikimedia Foundation. Wikipedia was launched on January 15 , 2001 , by Jimmy Wales and Larry Sanger .. Jimmy Wales. Jimmy Wales. Larry Sanger. Larry Sanger. Sanger coined Wikipedia , a portmanteau of wiki and encyclopedia .. portmanteau. portmanteau. wiki. wiki. There was only the English language version initially , but it quickly developed similar versions in other languages , which differ in content and in editing practices .. With articles , the English Wikipedia is the largest of the more than 290 Wikipedia encyclopedias .. English Wikipedia. English Wikipedia. Overall , Wikipedia consists of more than 40 million articles in more than 250 different languages and , , it had 18 billion page views and nearly 500 million unique visitors each month .. As of March 2017 , Wikipedia has about forty thousand high-quality articles known as Featured Articles and Good Articles that cover vital topics .. Featured Articles. WP :Featured Article. Good Articles. WP :Good Article. In 2005 , Nature published a peer review comparing 42 science articles from Encyclopædia Britannica and Wikipedia , and found that Wikipedia 's level of accuracy approached Encyclopædia Britannicas .. Nature. Nature ( journal ). Encyclopædia Britannica. Encyclopædia Britannica. Criticism of Wikipedia includes claims that it exhibits systemic bias , presents a mixture of `` truths , half truths , and some falsehoods '' , and that , in controversial topics , it is subject to manipulation and spin .. Criticism of Wikipedia. Criticism of Wikipedia. exhibits systemic bias. Bias in Wikipedia. spin. spin ( public relations )
related.