Fraser Illusion

The horizontal lines are parallel.
Just Say No
John Cummings was a game drunk. In June 1799, having watched a French mountebank pretend to swallow clasped knives, the 23-year-old American sailor boasted that he could do the same, and “after drinking freely” he proceeded to swallow his own pocketknife and three others offered by his friends.
Thus began a memorable career. According to George Budd in the Medical Times & Gazette, May 21, 1853, Cummings recounted his exploit in Boston six years later and was immediately challenged to repeat it. He swallowed six more knives, and an additional eight the following morning, “so that he had swallowed a knife for every day that the month was old.”
Why stop there? Nine months later, drunk again, he made the same boast in England and swallowed five knives on Dec. 4 and nine clasp kives on Dec. 5 (plus, he was told, another four that he was too drunk to remember).
Through the next four years, in great pain and continually vomiting, Cummings applied to a number of doctors, at least one of whom dismissed his story as incredible. But when he died finally in March 1809, his stomach was opened and “a great many portions of blades, knife-springs, and handles were found in it, and were carefully collected for the museum at Guy’s Hospital, in which they are now preserved,” Budd notes—Cummings’ contribution to medical science.
“Note How Your Friend Laughs”
It is a well known and easily demonstrated scientific fact that different people sound different vowels when laughing, from which fact a close observer has drawn the following conclusions: People who laugh in A (pronounced as ah) are frank, honest, and fond of noise and excitement, though they are often of a versatile and fickle disposition. Laughter in E (pronounced as ay) is peculiar to phlegmatic and melancholy persons. Those who laugh in I (pronounced as ee) are children or simple-minded, obliging, affectionate, timid, and undecided people. To laugh in O indicates generosity and daring. Avoid if possible all those who laugh in U, as they are wholly devoid of principle.
– Henry Williams, A Book of Curious Facts, 1903
A Novel Proof

We’ve had some pretty smart presidents. James Garfield devised this proof of the Pythagorean theorem in 1876, while serving in the House of Representatives:
The area of the trapezoid above is

The area of each green triangle is

And the yellow triangle is

So:

The Voting Paradox
Suppose we hold an election with three candidates, X, Y, and Z. And suppose the voters fall into three groups:
Group 1 prefers, in order, X, Y, Z
Group 2 prefers, in order, Y, Z, X
Group 3 prefers, in order, Z, X, Y
Now, if Candidate X wins, his opponents can rightly object that a majority of voters would have preferred Candidate Z. And corresponding arguments can be made against the other candidates. So even though we’ve held a fair election, it’s impossible to establish majority rule.
The Marquis de Condorcet noted this oddity in the 1700s; it’s sometimes known as Condorcet’s paradox.
R.I.P.
Epitaph in the churchyard of Llangerrig, Montgomeryshire:

– Charles Bombaugh, Facts and Fancies for the Curious From the Harvest-Fields of Literature, 1860
Plying the Blue
Phantom ships, as they have been called, have repeatedly been seen by various observers. Mr. Scoresby, in his voyage to Greenland, in 1822, saw an inverted image of a ship in the air, so well defined that he could distinguish by a telescope every sail, the peculiar rig of the ship, and its whole general character, insomuch that he confidently pronounced it to be his father’s ship, the Fame, which it afterwards proved to be.
– Charles Kingsley, The Boys’ and Girls’ Book of Science, 1881
See also The Wizard of Mauritius.
Math Notes
32 – 23 = 3 – 2