A place to show some of the odd/weird stuff I run across, especially holidays.
Holidays 2021-03-22
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Holidays today are about sustainable freshwater resources, goofing off, drawing attention to the cruelty of seal hunts, feeling young even if you're not, and Bavarian crepes:
Though attracting attention to seal hunting was the main inspiration behind the International Day of the Seal, I'm going to provide a non-hunting seal picture.
As I'm wont to do, here's another of my yearly reviews. It's at least a weak attempt to stay in touch with many of you that I rarely see in person. As I explain every year , the main downside is that I really don't do very much. And much of what I do is not particularly interesting. If any of you nod off during this, at your age you probably needed the rest anyway. If you're wondering, that's dinosaur ... wearing an Ankylosaurus hoodie Health : Barring a knee replacement, I can't imagine I'll ever have a truly healthy knee, though my impression is that it was somewhat less troublesome this year. I have 2 amateurish theories about that: Perhaps the collagen supplements I've been taking in recent years has mitigated the knee problems a bit. I've also wondered whether they've slowed down my hair loss a little. It's kind of hard to say. Maybe, just maybe, I've done a better job of backing off my morning jogging when the knee starts to bec...
The Festival of Wepet Renpet was a matter of life and death in ancient Egypt - it was held each year when the Nile River flooded, irrigating the fields that the Egyptians depended on for much of their food. It was also considered the Egyptian New Year. Since it depended on a flood, the date is an approximation. Of course the ancient Egyptians understood that Wepet Renpet had nothing to do with rain in the Ethiopian highlands; they understood that the deities Khnum and Neith were satisfied with their offerings. Photo by British Library on Unsplash
Happy Catalan Numbers Day! Catalan numbers are a sequence of numbers that represent the counts of several mathematical concepts. They're named after Eugene Charles Catalan , a French-Belgian mathematician who worked on number theory and combinatorics . One of the things Catalan numbers count are the number of Dyck words, which are words consisting of X's and Y's which: Consist of an equal number of X's and Y's, And where all beginning sub-words have their number of X's greater than or equal to their number of Y's. For example, XYXY is a Dyck word because XYX, XY, and X are all beginning sub-words where there are at least as many X's as Y's. But XYYX is not a Dyck word because XYY is a beginning sub-word where there are more Y's than X's. Note that if you substitute "(" for X and ")" for Y, Dyck words constitute a valid sequence for arithmetic or regular expressions. Here are the smallest Dyck words. This video provides...
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