Franklin’s Magickest Square

http://books.google.com/books?id=yE0YAQAAIAAJ&pg=PA293

When a friend showed him a 16 × 16 magic square devised by Michel Stifelius, Ben Franklin went home and composed the square above, “not willing to be outdone.” An admirer describes its properties:

1. The sum of the sixteen numbers in each column or row, vertical or horizontal, is 2,056. — 2. Every half column, vertical or horizontal, makes 1,028, or just one half of the same sum, 2,056. — 3. Any half vertical row added to any half horizontal, makes 2,056. — 4. Half a diagonal ascending added to half a diagonal descending, makes 2,056, taking these half diagonals from the ends of any side of the square to the middle of it, and so reckoning them either upward, or downward, or sideways. — 5. The same with all the parallels to the half diagonals, as many as can be drawn in the great square: for any two of them being directed upward and downward, from the place where they begin to that where they end, make the sum 2,056; thus, for example, from 64 up to 52, then 77 down to 65, or from 194 up to 204, and from 181 down to 191; nine of these bent rows may be made from each side. — 6. The four corner numbers in the great square added to the four central ones, make 1,028, the half of any column. — 7. If the great square be divided into four, the diagonals of the little squares united, make, each, 2,056. — 8. The same number arises from the diagonals of an eight sided square taken from any part of the great square. — 9. If a square hole, equal in breadth to four of the little squares or cells, be cut in a paper, through which any of the sixteen little cells may be seen, and the paper be laid on the great square, the sum of all the sixteen numbers seen through the hole is always equal to 2,056.

Franklin wrote, “This I sent to our friend the next morning, who, after some days, sent it back in a letter with these words: ‘I return to thee thy astonishing or most stupendous piece of the magical square, in which’ — but the compliment is too extravagant, and therefore, for his sake as well as my own, I ought not to repeat it. Nor is it necessary; for I make no question but you will readily allow this square of 16 to be the most magically magical of any magic square ever made by any magician.”

(“Clavis,” “Magic Squares,” The Mirror of Literature, Amusement, and Instruction 4:109 [Oct. 23, 1824], 293-294.) (Thanks, Walker.)

12/21/2020 UPDATE: The square appeared originally in 1767 in James Ferguson’s Tables and Tracts, Relative to Several Arts and Sciences and was reprinted a year later in the Gentleman’s Magazine. Only the second publication credits Franklin. I don’t have a date for Franklin’s purported composition, so I don’t know what to make of this. (Thanks, Tom.)

Hex

https://commons.wikimedia.org/wiki/File:HEX_11x11_(47).jpg
Image: Wikimedia Commons

Invented independently by Piet Hein and John Nash, the game of Hex is both simple and deep. Each player is assigned two opposite sides of the board and tries to connect them with an unbroken chain of stones. Draws are impossible, and in principle it can be shown that the first player has a winning strategy (if the second player had such a strategy, the first player could “steal” it with a move in hand). But succeeding in practical play requires careful, subtle thought.

You can try it here.

The Value of Disagreement

In 1907, Francis Galton famously found that when a crowd were asked to guess the weight of an ox, the average value of their responses was surprisingly accurate — in Galton’s experiment, it fell within 1 percent of the ox’s true weight. This is “the wisdom of crowds”: By canceling errors across individuals, the mean response often proves more accurate than individual estimates.

Interestingly, the same phenomenon can arise when we aggregate multiple estimates made by a single person (the “wisdom of the inner crowd”). And organizational behavior researchers Philippe van de Calseyde and Emir Efendić now find that the accuracy can be refined still further when people are asked to consider a question from the perspective of someone they often disagree with.

“In explaining its accuracy, we find that taking a disagreeing perspective prompts people to consider and adopt second estimates they normally would not consider as viable option, resulting in first and second estimates that are highly diverse (and by extension more accurate when aggregated),” the researchers write. “Our results suggest that disagreement, often highlighted for its negative impact, can be a powerful tool in producing accurate judgments.”

(Philippe van de Calseyde and Emir Efendić, “Taking a Disagreeing Perspective Improves the Accuracy of People’s Quantitative Estimates,” PsyArXiv, Nov. 15, 2019.)

Misc

https://commons.wikimedia.org/wiki/File:Pete_Conrad_on_LM_ladder,_Apollo_12.jpg

  • Peter Davison, who played the fifth Doctor in Doctor Who, is the father-in-law of David Tennant, who played the 10th.
  • Sharks are older than trees.
  • ABHORS, ALMOST, BEGINS, BIOPSY, and CHINTZ are alphabetical.
  • \displaystyle \sqrt{7! + 1} = 71
  • “The punishment can be remitted; the crime is everlasting.” — Ovid

“Whoopee! Man, that may have been a small one for Neil, but that’s a long one for me!” — Pete Conrad, after becoming the third human to set foot on the moon

A Sad Mystery

https://commons.wikimedia.org/wiki/File:Dead_seal,_South_Fork,_Upper_Wright_Valley_2016_01.jpg
Image: Wikimedia Commons

In 1903 Robert Falcon Scott made an odd discovery in the Dry Valleys of Antarctica:

[W]e have seen no living thing, not even a moss or a lichen; all that we did find, far inland amongst the moraine heaps, was the skeleton of a Weddell seal, and how that came there is beyond guessing. It is certainly a valley of the dead; even the great glacier which once pushed through it has withered away.

It appears that periodically a crabeater, Weddell, or leopard seal finds its way inland from McMurdo Sound and the Ross Sea and perishes in the punishing environment of the dry valleys, an extreme desert. There the dry conditions mummify its corpse, preserving it in some cases for thousands of years.

Some mummies have been found as much as 41 miles inland and as high as 5,900 feet above sea level, reflecting a heroic effort to find the sea. Mercifully the phenomenon is relatively rare, with a seal becoming lost only once every 4 to 8 years.

Podcast Episode 321: The Calculating Boy

https://books.google.com/books?id=7bcVAAAAYAAJ&pg=PA1#v=onepage&q&f=false

George Parker Bidder was born with a surprising gift: He could do complex arithmetic in his head. His feats of calculation would earn for him a university education, a distinguished career in engineering, and fame throughout 19th-century England. In this week’s episode of the Futility Closet podcast, we’ll describe his remarkable ability and the stunning displays he made with it.

We’ll also try to dodge some foul balls and puzzle over a leaky ship.

See full show notes …

Knowledge and Belief

https://commons.wikimedia.org/wiki/File:PSM_V12_D306_Logic_of_science_test.jpg

Imaginary distinctions are often drawn between beliefs which differ only in their mode of expression;– the wrangling which ensues is real enough, however. To believe that any objects are arranged as in Fig. 1, and to believe that they are arranged as in Fig. 2, are one and the same belief; yet it is conceivable that a man should assert one proposition and deny the other. Such false distinctions do as much harm as the confusion of beliefs really different, and are among the pitfalls of which we ought constantly to beware, especially when we are upon metaphysical ground. One singular deception of this sort, which often occurs, is to mistake the sensation produced by our own unclearness of thought for a character of the object we are thinking. Instead of perceiving that the obscurity is purely subjective, we fancy that we contemplate a quality of the object which is essentially mysterious; and if our conception be afterward presented to us in a clear form we do not recognize it as the same, owing to the absence of the feeling of unintelligibility. So long as this deception lasts, it obviously puts an impassable barrier in the way of perspicuous thinking; so that it equally interests the opponents of rational thought to perpetuate it, and its adherents to guard against it.

— Charles Sanders Peirce, “Illustrations of the Logic of Science: How to Make Our Ideas Clear,” Popular Science Monthly, January 1878