  Quantum nonlocality and quantum steering are fundamental correlations of
quantum systems which can not be created using classical resources only.
Nonlocality describes the ability to influence the possible results of
measurements carried out in distant systems, in quantum steering Alice remotely
steers Bob's state. Research in nonlocality and steering possess a fundamental
interest for the development of quantum information and in many applications
requiring nonlocal resources like quantum key distribution. On the other hand,
the Stern-Gerlach experiment holds an important place in the history,
development and teaching of quantum mechanics and quantum information. In
particular, the thought experiment of consecutive Stern-Gerlach Experiments is
commonly used to exemplify the concept of non-commutativity between quantum
operators. However, to the best of our knowledge, the consecutive Stern-Gerlach
Experiments have not been treated in a fully quantum manner yet, and it is a
widely accepted idea that atoms crossing consecutive Stern-Gerlach Experiments
follow classical paths. Here we demonstrate that two consecutive Stern-Gerach
Experiment generate nonlocality and steering, these nonlocal effects strongly
modify our usual understanding of this experiment. Also, we discuss the
implications of this result and its relation with the entanglement. This
suggests the use of quantum correlations, of particles possessing mass, to
generate nonlocal taks using this venerable experiment.
