The new math tutorial about rotation is interesting but could use a proofing pass to make it easier to read. It has a lot of redundant adverbs, parentheses, typos, passive tense, long sentences, etc.: ...

The majority of medical school graduates have little training in primary care or experience with a continuity setting. This contributes to a sense of frustration and lack of preparedness when internal ...

A linear operator which rotates a Euclidean vector about an axis can be represented as a transformation matrix. Applying the operator can then be reduced to matrix multiplication, details.