Can G-d create a rock He cannot lift? Can impossible things exist? Is G-d limited by logic?
How was it possible for Chanukah oil to be miraculous if kosher oil for menorah has to be natural? If the oil was natural, how did the miracle happen?
For this and much more, for synthesis of deepest Kabbalistic and Chassidic concepts with Halachic questions (posed by no less than Brisker Rav and answered by no less than Lubavitcher Rebbe), listen to this audio-shiur by Rabbi Yossi Paltiel. No knowledge of deep concepts in Judaism necessary.