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Math Corner brainteaser. In the Math Corner at the end of my March Diary I stated a theorem about divisibility and challenged readers to prove it. My proof is here.  Dickens, Twain, and that tobacco.  Also in the March Diary I wondered if the reference to "Negro-head" tobacco in my 2003 Barnes & Noble Classics edition of Great Expectations, Chapter 40, was a bowdlerization of something slightly different in the 1861 original of that novel.  Several readers stepped up to that one. Sorry, John; it's "Negro-head" all right. At least it is in the Sheldon & Co edition, 1862. Nothing to be sorr...

a- I've gotten wa-a-a-ay behind with email, what with the holidays and all, so this goes all the way back to mid-December. Most recent items first. • Woo, Woom?   In the Math Corner segment of my December Diary I scoured the internet for interesting things to say about the number 2021. Among them I noted that  : If woo is your thing, you'll be yearning to know the significance of 2021 as an Angel Number: "Angel number 2021 will try to convey to you that you are the creator of your life. This angel number 2021 encourages you to stay focussed on your goals. The universal energy will help ...