Vanishing Act

http://commons.wikimedia.org/wiki/File:M%C3%B6bius_strip.jpg
Image: Wikimedia Commons

In 1913 mathematician P.E.B. Jourdain proposed a familiar paradox:

On one side of a blank strip of paper, write The statement on the other side of this paper is true.

On the other side, write The statement on the other side of this paper is false.

“The paradox in this form is quite vulnerable to an absolute refutation,” wrote Valdis Augstkalns in a 1970 letter to The Listener. “One takes the paper, gives it a half twist, and joins the ends to form a Möbius strip. The serious and philosophically legitimate question is transformed to ‘Eminent members of the panel, which is the other side of the paper?'”

| Science & Math

Signs and Wonders

COLUMBIA, S.C., May 29. — Closely following the appearance of the hand of flame in the heavens above Ohio comes a story from Darlington County, in this State, of a flying serpent. Last Sunday evening, just before sunset, Miss Ida Davis and her two younger sisters were strolling through the woods, when they were suddenly startled by the appearance of a huge serpent moving through the air above them. The serpent was distant only two or three rods when they first beheld it, and was sailing through the air with a speed equal to that of a hawk or buzzard, but without any visible means of propulsion. Its movements in its flight resembled those of a snake, and it looked a formidable object as it wound its way along, being apparently about 15 feet in length. The girls stood amazed and followed it with their eyes until it was lost to view in the distance. The flying serpent was also seen by a number of people in other parts of the county early in the afternoon of the same day, and by those it is represented as emitting a hissing noise which could be distinctly heard.

— New York Times, May 30, 1888

| Oddities

Blind Man’s Buff

http://www.google.com/patents/US4173016

Carlisle H. Dickson’s “interpersonal-introduction signalling system,” patented in 1979, takes some of the pain out of the singles scene. Each person at a gathering carries a transceiver encoded with his or her own characteristics and preferences. So, for example, a woman can program her receiver to ignore every message except “I am a male, I want to dance with you, my music preference is hard rock.” When that signal is received, her receiver signals that the man can approach “with confidence not only of mutual interest, but of receptive mood.”

At this point the man doesn’t know exactly who or where she is, only that there’s a (minimally) compatible woman somewhere in the crowd. He begins to home in her using something like a Geiger counter, and this gives her time to spot him and change her mind — “at any time she may switch off her receiver, transmitter or both.”

“In a particularly novel construction, the apparatus may be further provided with a decoy means such that if the receiving party decides not to meet, the apparatus can be switched to create a false signal, such as the reversing of the characteristic created to assist the parties approaching each other.”

| Society · Technology

Word of Mouth

http://commons.wikimedia.org/wiki/File:Death_of_Nelson.jpg

Letter to the Times, Jan. 15, 1915:

Sir,

May I add another illustration to those which have already appeared in your columns, showing how near two lives can bring together events which seem so far apart? I remember my father telling me how, when he was attending a country grammar school in 1805, one day the master came in, full of a strange excitement, and exclaimed, ‘Boys, we’ve won a great victory!’ Then he stopped, burst into tears, and added, ‘But Nelson — Nelson is killed!’ When I was myself a boy Waterloo was a recent event, and even ‘the ’45’ was remembered and talked about.

In a few weeks I shall be 85, but I can still ride my bicycle.

William Wood, DD

| History

Resemblance

Harry Mathews composed this limerick:

Young Dick, always eager to eat,
Denied stealing the fish eggs, whereat,
Caning him for a liar,
His pa ate the caviar
And left Dicky digesting the caveat.

Shouldn’t it rhyme?

| Language · Poems

Meeting the Locals

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Henry Hudson made this curious journal entry in the Canadian arctic, June 15, 1610:

This morning one of our company looking overboard saw a mermaid; and calling up some of the company to see her, one more came up, and by that time she was come close to the ship’s side, looking earnestly on the men. A little after, a sea came and overturned her. From the navel upward, her back and breasts were like a woman’s, as they say that saw her; her body as big as one of us; her skin very white; and long hair hanging down behind, of colour black. In her going down they saw her tail, which was like the tail of a porpoise, and speckled like a mackerel. Their names that saw her were Thomas Hilles and Robert Rayner.

“Whatever explanation be attempted of this apparition,” wrote Philip Gosse, “the ordinary resource of seal or walrus will not avail here. Seals and walruses must have been as familiar to these polar mariners as cows to a dairy-maid. Unless the whole story was a concerted lie between the two men, reasonless and objectless, — and the worthy old navigator doubtless knew the character of his men, — they must have seen, in the black-haired, white-skinned creature, some form of being as yet unrecognized.”

| Oddities

Hidden Monsters

Last year, University of Queensland psychology undergraduate Sean Murphy was collecting images of faces while preparing an experiment. As he skimmed through them, he noticed that they began to appear grotesque and deformed, though when viewed individually they appeared normal and even attractive. (The demonstration above uses photographs of celebrities.)

“The effect seems to depend on processing each face in light of the others,” writes grad student Matthew Thompson, who published the result last year with Murphy and Jason Tangen. “By aligning the faces at the eyes and presenting them quickly, it becomes much easier to compare them, so the differences between the faces are more extreme. If someone has a large jaw, it looks almost ogre-like. If they have an especially large forehead, then it looks particularly bulbous. We’re conducting several experiments right now to figure out exactly what’s causing this effect.”

(Tangen, J. M., Murphy, S. C., & Thompson, M. B. (2011). Flashed face distortion effect: Grotesque faces from relative spaces. Perception, 40, 628-630.)

| Oddities