Professor Shackleton sighed and stood up slowly from her chair. She walked around to the front of her desk, leaning against the edge for support, and began the lesson by saying, "This lesson will be fairly brief in comparison to most others, simply covering the topic of the Major Cycles. I am feeling a bit off, so please excuse me if I need to sit down and teach from my desk at some point." Macadrian gave a small sigh and continued, "So, what exactly are the Major Cycles?"