With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Jeff Bezos is planning for commercial underwater human exploration.
text_B: Louis Norberg Howard -LRB- March 12 , 1929 -- June 28 , 2015 -RRB- was an American mathematician who was professor emeritus of mathematics at the Massachusetts Institute of Technology .. Massachusetts Institute of Technology. Massachusetts Institute of Technology. He contributed to a broad range of subjects , including hydrodynamic stability and geophysical flows .. He made a number of key advances in our understanding of turbulent convection , flows in Hele-Shaw cells , salt-finger zones , rotating flows , and reaction -- diffusion equations .. Hele-Shaw cells. Hele-Shaw flow
not_related.