With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: George R. R. Martin was born in the first half of the 20th century.
text_B: The 20th century was a century that began on. century. century. January 1 , 1901 and ended on December 31 , 2000 .. It was the tenth and final century of the 2nd millennium .. century. century. 2nd millennium. 2nd millennium. It is distinct from the century known as the 1900s which began on January 1 , 1900 , and ended on December 31 , 1999 .. century. century. The 20th century was dominated by a chain of events that heralded significant changes in world history as to redefine the era  : World War I and World War II , nuclear power and space exploration , nationalism and decolonization , the Cold War and post-Cold War conflicts ; intergovernmental organizations and cultural homogenization through developments in emerging transportation and communications technology ; poverty reduction and world population growth , awareness of environmental degradation , ecological extinction ; and the birth of the Digital Revolution .. century. century. World War I. World War I. World War II. World War II. nuclear power. nuclear power. space exploration. space exploration. nationalism. nationalism. decolonization. decolonization. Cold War. Cold War. cultural homogenization. cultural homogenization. emerging. Emerging technologies. transportation. transportation. communications technology. communications technology. poverty reduction. poverty reduction. world population. World population milestones. environmental degradation. environmental degradation. ecological extinction. ecological extinction. Digital Revolution. Digital Revolution. It saw great advances in communication and medical technology that by the late 1980s allowed for near-instantaneous worldwide computer communication and genetic modification of life .. near-instantaneous worldwide computer communication. Internet. genetic modification. genetic modification. The term `` short twentieth century '' was coined to represent the events from 1914 to 1991 .. century. century. short twentieth century. short twentieth century. Global total fertility rates , sea level rise and ecological collapses increased ; the resulting competition for land and dwindling resources accelerated deforestation , water depletion .. sea level rise. sea level rise. deforestation. deforestation. and the mass extinction of half the world 's estimated nine million unique species and wildlife population ; consequences which are now being dealt with .. mass extinction. extinction event. wildlife population. Holocene extinction. It took all of human history up to 1804 for the world 's population to reach 1 billion ; world population reached an estimated 2 billion in 1927 ; by late 1999 , the global population reached 6 billion .. world population. World population milestones. Global literacy averaged 80 % ; global lifespan-averages exceeded 40 + years for the first time in history , with over half achieving 70 + years -LRB- three decades longer than it was a century ago -RRB- .. century. century. literacy. literacy
related.