In truth it shouldn't fly, at least not very straight.
Flight is nothing more than overcoming the forces of weight and drag by generating lift and thrust.
An engine creates forward thrust and, as the plane moves, air begins to rush over the top of the wings, creating lift. As long as the air keeps rushing over the wings, the plane keeps flying. Conventional aircraft have wings and a tail to give pilots more control and allow them to steer the aircraft. The wings are angled upward or downward in a dihedral shape for additional balance. The B-2, it would seem, has none of this going for it.