With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: STS-96 was grounded at 6:49 AM.
text_B: In physics , self-organized criticality -LRB- SOC -RRB- is a property of dynamical systems that have a critical point as an attractor .. physics. physics. critical point. critical point ( physics ). attractor. attractor. Their macroscopic behaviour thus displays the spatial and / or temporal scale-invariance characteristic of the critical point of a phase transition , but without the need to tune control parameters to a precise value , because the system , effectively , tunes itself as it evolves towards criticality .. critical point. critical point ( physics ). scale-invariance. scale invariance. phase transition. phase transition. The concept was put forward by Per Bak , Chao Tang and Kurt Wiesenfeld -LRB- `` BTW '' -RRB- in a paper. Per Bak. Per Bak. Chao Tang. Chao Tang. Kurt Wiesenfeld. Kurt Wiesenfeld. published in 1987 in Physical Review Letters , and is considered to be one of the mechanisms by which complexity arises in nature .. Physical Review Letters. Physical Review Letters. complexity. complexity. Its concepts have been enthusiastically applied across fields as diverse as geophysics , physical cosmology , evolutionary biology and ecology , bio-inspired computing and optimization -LRB- mathematics -RRB- , economics , quantum gravity , sociology , solar physics , plasma physics , neurobiology and others .. physics. physics. geophysics. geophysics. physical cosmology. physical cosmology. evolutionary biology. evolutionary biology. ecology. ecology. bio-inspired computing. bio-inspired computing. economics. economics. quantum gravity. quantum gravity. sociology. sociology. solar physics. solar physics. plasma physics. plasma physics. neurobiology. neurobiology. SOC is typically observed in slowly driven non-equilibrium systems with extended degrees of freedom and a high level of nonlinearity .. non-equilibrium. non-equilibrium thermodynamics. degrees of freedom. degrees of freedom ( physics and chemistry ). nonlinearity. nonlinearity. Many individual examples have been identified since BTW 's original paper , but to date there is no known set of general characteristics that guarantee a system will display SOC .
not_related.