I had chance last night to return to organic chemistry. As usual, I found the explanations of the means to identify compounds. This time it’s the nuclear magnetic resonance. I don’t think I had a thorough explanation.\ in Morrison and Boyd, but I could’ve muffed it.

I’ve begun a series of courses toward data science. The one on statistics goes over some material I’ve known, but the definitions of covariance and correlation are new to me as to their mathematical explanation.