The Tri-State Tornado of 1925 traveled 200 miles through the American Midwest, killing nearly 700 people.

Along the way, it drove a 1×5-inch board through a 2×6-inch plank.

If you’re a woman and want to humiliate a man, invite him to watch you do this:

1. Stand with your toes touching a wall.
2. Placing one foot immediately behind the other, take two steps back.
3. Have him place a chair between you and the wall.
4. Bend at the waist and place the top of your head against the wall.
5. Lift the chair.
6. Stand erect.

Now challenge him to do the same. If he’s like most men he’ll get stuck on step 6. The common explanation is that men’s hips are built differently; they also have proportionally bigger feet. Either way, you can easily pick his pocket while he’s struggling there.

Mark Lindsey had just graduated from the Virginia Tech architecture school in 1982 when his firm was asked to design an addition to the football stadium at VT’s rival, the University of Virginia.

“There was a V-shaped opening at the end of the stadium,” he told the Richmond Times-Dispatch. “And I had a late-night inspiration that the best thing to put in this V-shaped opening was a T.”

To everyone’s surprise, UVA bought it, and Bryant Hall opened in 1985. In fact, though the VT logo was clearly visible from the air, UVA officials didn’t notice it until it was pointed out. They replaced the building in 1999.

“It’s been a great little story to tell at parties,” Lindsey said.

Here’s a familiar illusion known as the Ames room. The woman on the right is not really small, she’s just far away. The room is a trapezoid but is designed to appear square when viewed from this angle.

Curiously, a woman who loves and trusts her husband tends to see no change in him even as he walks from corner to corner; apparently she resists a distorted view of him.

The same is not true of men.

Suffolk’s “House in the Clouds” disguised a water tower in 1923, but since 1979 it’s been fully converted into living space, with five bedrooms and three bathrooms.

You can try it for yourself for £700 a night: “Total of 67 easy stairs with 4 landings and 5 half landings–resting seats for the less able on each landing.”

Last March I remarked on a curious experiment that defies common sense but is corroborated by several independent accounts, from Samuel Pepys to David Brewster.

Well, here’s another one. In Endless Amusement: A Collection of Nearly 400 Entertaining Experiments in Various Branches of Science (1821), we find an item headed “The Hour of the Day or Night Told by a Suspended Shilling”:

However improbable the following experiment may appear, it has been proved by repeated trials:

Sling a shilling or sixpence at the end of a piece of thread by means of a loop. Then resting your elbow on a table, hold the other end of the thread betwixt your forefinger and thumb; observing to let it pass across the ball of the thumb, and thus suspend the shilling into an empty goblet. Observe, your hand must be perfectly steady; and if you find it difficult to keep it in an immoveable posture, it is useless to attempt the experiment. Premising, however, that the shilling is properly suspended, you will observe, that when it has recovered its equilibrium, it will for a moment be stationary: it will then of its own accord, and without the least agency from the person holding it, assume the action of a pendulum, vibrating from side to side of the glass; and, after a few seconds, will strike the hour nearest to the time of day; for instance, if the time be twenty-five minutes past six, it will strike six; if thirty-five minutes past six, it will strike seven, and so of any other hour.

It is necessary to observe, that the thread should lay over the pulse of the thumb, and this may in some measure account for the vibration of the shilling; but to what cause its striking the precise hour is to be traced, remains unexplained; for it is no less astonishing than true, that when it has struck the proper number, its vibration ceases, it acquires a kind of rotary motion, and at last becomes stationary, as before.

This is worth trying even if you think it’s balderdash, as the effect is striking. In my trials the plumb hung true for a full minute, but then it did indeed begin swinging, tolled the hour, and then hung quietly again.

Who came up with this? From what I can tell, the item first appeared in the European Magazine of June or July 1819, and it seems to have inspired a fitful scientific debate around England. The Monthly Magazine (May 1, 1820) called it “legerdemain”; a letter in The Kaleidoscope (Nov. 22, 1823) confirmed the effect, “but why its movements should be regulated to the precise hour of the day I cannot possibly account for.” The Minerva (July 24, 1824) gave a fairly straightforward account of the technique; and The English Mechanic (June 14, 1872) expressed polite bafflement.

Interestingly, when The Magazine of Science, and School of Arts (Jan. 1, 1842) opined that “there is no truth whatever in the experiment,” a science-minded reader wrote in to disagree, detailing numerous trials with various materials at various hours and concluding that “I honestly confess I cannot explain it.” He offered these notes if you’d like to try it yourself:

• “I remarked on many occasions, that should the suspended coin fail of striking all the hours consecutively, it will vibrate on until it obtains momentum to perform its work.”
• “The operator must have a steady hand and arm and a fair proportion of patience.”
• It seems to work best with a metal weight, a silk string, and a warm glass.

Your eyes are fine; the tower is crooked. The 86-foot church steeple in Suurhusen, in northern Germany, inclines 5 degrees — a full degree more than the Leaning Tower of Pisa.

From Hastings, on the English shore, to the French cliffs, is more than fifty miles, and they are of course hid from each other by the convexity of the earth. On the evening of the 26th of July, 1798, the coast of France was visible at Hastings to the naked eye for several leagues, as though only a few miles off. Every spot was distinctly seen from Calais, Boulogne, as far as Dieppe. With the aid of a telescope, the fishing boats were seen at anchor, the different colors of the land upon the heights were distinguishable, and the sailors pointed out the places they were in the habit of visiting. The account of the phenomenon was drawn up by Mr. Lanham, a fellow of the Royal Society, who was an eye witness.

— The Thomsonian Recorder, Aug. 30, 1834