The Bridges of Konigsberg

In old Konigsberg there were seven bridges:

http://commons.wikimedia.org/wiki/Image:Konigsberg_bridges.png
Image: Wikimedia Commons

Villagers used to wonder: Is it possible to leave your door, walk through the town, and return home having crossed each bridge exactly once?

Swiss mathematician Leonhard Euler had to invent graph theory to answer the question rigorously, but there’s a fairly intuitive informal proof. Can you find it?

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| Puzzles · Science & Math

“Mister Eat-Everything”

France’s Michel Lotito, better known as Monsieur Mangetout, eats metal and glass for a living. He began eating unusual materials compulsively as a child and has made it into a career, performing publicly since 1966.

Thanks to an unusually thick stomach lining, Mangetout can safely consume 2 pounds of metal a day with no ill effects. Generally he cuts large items — bicycles, television sets, shopping carts, a coffin — into 1-kilogram pieces, which he washes down with mineral oil and plenty of water.

In 1978 he started eating a small plane, a Cessna 150. He finished it in 1980.

| Oddities

Petroleum V. Nasby on “The Woman Question”

  • From the begining woman has occupied a dependent position, and has been only what man has made her. The Turks, logical fellows, denied her a soul, and made of her an object of barter and sale; the American Indians made of her a beast of burden. In America, since we extended the area of civilization by butchering the Indians, we have copied both.
  • The inferiority of the sex is easy of demonstration. It has been said that the mother forms the character of the man so long, that the proposition has become axiomatic. If this be true, we can crush those who prate of the equality of women, by holding up to the gaze of the world the inferior men she has produced. Look at the Congress of the United States.
  • My friend is learned. She has a tolerable knowledge of Greek, is an excellent Latin scholar, and as she has read the Constitution of the United States, she excels in political lore the majority of our representatives in Congress. But nevertheless I protest against her voting for several reasons:
    1. She cannot sing bass! Her voice, as Dr. Bushnell justly observes in his blessed book, is pitched higher than the male voice, which indicates feminine weakness of mind.
    2. Her form is graceful rather than strong.
    3. She delights in millinery goods.
    4. She can’t grow whiskers.

— Satirical lyceum speaker Petroleum Vesuvius Nasby, “The Struggles of a Conservative with the Woman Question,” 1868

| History · Society

Pareidolia

http://en.wikipedia.org/wiki/Image:Canadiandollar_devilshead.gif

Pareidolia is the experience of “seeing” something in a stimulus that’s simply vague and random.

You’ve felt it if you’ve ever seen images of animals or faces in clouds, or the man in the moon, or heard messages when records are played in reverse. It’s the basis for the Rorschach inkblot test.

This is a portrait of Elizabeth II as it appeared on the 1954 series Canadian dollar bill. So many people thought they saw the face of the devil in the queen’s hair that the bills were eventually withdrawn from circulation.

There’s nothing there — the portrait was adapted from a photograph.

| Oddities

A Lifetime’s Eating

“A French statistician has just ascertained that a human being of either sex who is a moderate eater and who lives to be 70 years old consumes during his life a quantity of food which would fill twenty ordinary railway baggage cars. A good eater, however, may require as many as thirty.”

— Barkham Burroughs’ Encyclopaedia of Astounding Facts and Useful Information, 1889

| Trivia