With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Supernatural pilot was directed by an American television director.
text_B: Rao Yutai -LRB- Chinese  : 饒毓泰 ; December 1 , 1891 - October 16 , 1968 -RRB- was a Chinese physicist , one of the founders of modern physics in China .
not_related.