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Neutrinos seem to hold the key to many great questions of physics. Understanding these elusive particles could provide the answer to why the Universe is dominated by matter, why the neutrino mass is so small and if there are any more types of neutrinos. However, studying neutrinos is not an easy task. Their weak interactions require very large detectors and the detail of their interactions is much more complex then previously assumed. Liquid argon (LAr) technology opens new opportunities to study neutrinos with unprecedented detail. After briefly reviewing the basis and the great questions of neutrino physics, I will present the principle of LAr detectors and describe how they can help us addressing some of the remaining puzzles of our field. I will also review some recent results of the MicroBooNE experiment, an important milestone in the future short- and long- baseline programs in the US.