  Contextuality provides a unifying paradigm for nonclassical aspects of
quantum probabilities and resources of quantum information. Unfortunately, most
forms of quantum contextuality remain experimentally unexplored due to the
difficulty of performing sequences of projective measurements on individual
quantum systems. Here we show that two-point correlations between binary
compatible observables are sufficient to reveal any form of contextuality. This
allows us to design simple experiments that are more robust against
imperfections and easier to analyze, thus opening the door for observing
interesting forms of contextuality, including those requiring quantum systems
of high dimensions. In addition, it allows us to connect contextuality to
communication complexity scenarios and reformulate a recent result relating
contextuality and quantum computation.
