With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Bill Gates was born on November 3, 1912.
text_B: Heavier Than Heaven is a 2001 biography of musician Kurt Cobain , the frontman of the grunge band Nirvana .. Kurt Cobain. Kurt Cobain. grunge. grunge. Nirvana. Nirvana ( band ). It was written by Charles R. Cross .. Charles R. Cross. Charles R. Cross. For the book , Cross desired to create the definitive Cobain biography , and over four years conducted 400 + interviews ; in particular , he was granted exclusive interviews and access to Cobain 's private journals , lyrics and photos , by his widow Courtney Love .. Courtney Love. Courtney Love. Notably , neither Nirvana drummer Dave Grohl nor Cobain 's mother contributed to the book .. Nirvana. Nirvana ( band ). Dave Grohl. Dave Grohl. Cross took the name `` Heavier Than Heaven '' from a tour Nirvana did with the band Tad in the United Kingdom .. Nirvana. Nirvana ( band ). Tad. Tad ( band ). The lead singer , Tad Doyle , was very obese ; the name which was thought up by the tour promoters , was meant in part to poke fun at the inaccurate idea that Tad alone weighed more than all of the members of Nirvana put together .. Nirvana. Nirvana ( band ). Tad. Tad ( band )
not_related.