Winter Camp 2009 Cyclic Quadrilaterals Yufei Zhao Cyclic Quadrilaterals — The Big Picture Yufei Zhao yufeiz@mit.edu An important skill of an olympiad geometer is being able to recognize known configurations. Indeed, many geometry problems are built on a few common themes. In this lecture, we ...
One of the bedrock bits of the chordate body plan is a connective tissue notochord running down the body axis, with a big nerve cord sitting on top and a big artery hanging just below. In vertebrates the notochord is mostly replaced by the vertebral column, and we refer to the big nerve...
There is one unique individual spirit per being, whether rock, plant, animal, alien, entity, or human – anywhere in the universe. It is both inside and above each individual. Souls are very different. They are a specialty of Earth, which is the planet focusing on the evolution of souls....