Questions tagged [real]

For puzzles that presented themselves, with real parameters and consequences, during otherwise non-puzzling activities.

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2
votes
2answers
398 views

How to Charge Our Devices in this Machine?

Warning: It is actually a simple "puzzle" which is silly but debatably unique as it really happens to me in real life. I'm amazed with nowadays technology. When I go to one of the shopping mall in ...
15
votes
5answers
2k views

Optimal Money-Saving on the NYC Metro

You are on vacation in New York City. You didn't bring your car, and it's currently around $-50^\circ C$, so it's probably a good idea to take the NYC metro subway to move around. You need a metro ...
0
votes
2answers
151 views

Pray they can hold it in for two hours? [closed]

I use to to help with the nursery at a very small church. The Nursery was downstairs next to the the two small restrooms for males/females. Whenever I had to go out to a restroom to get towels or ...
-6
votes
3answers
480 views

What do these two places have in common?

In the United States of America, the New York City Borough of Queens lies at the west end of Long Island. More than 5000km across the Atlantic ocean lies the Metropolitan Borough of Bolton, a borough ...
5
votes
2answers
473 views

Improve my 3D puzzle

3D View of one solutions http://autode.sk/2Dg4FWx I designed a 4x4x4 soma cube in AutoCad and then built it with wood cubes. There are twelve pentacubes and one tetracubes. Each piece is unique and ...
15
votes
1answer
733 views

Code Cracking 1984

This is a code from an old home computer magazine. Still it is unknown the cipher used for it, although they gave the solution: ...
-4
votes
2answers
374 views

Length of mystery object

What everyday object is ${n}^{-1/4}$ metres long, where $n$ is an integer? Hint: n= Note there may be some cultural dependence here.
-3
votes
2answers
243 views

A toy needs 3 batteries, but I only have 2 batteries [closed]

I have a boy, he has a toy which need 3 batteries, but I only have 2 batteries. With an easy hack I can switch on the toy to work properly. What did I do?
56
votes
22answers
17k views

Can you open the bathroom door? [closed]

This happened to me in a rental apartment and I had to be creative to solve it. The geniuses who designed the bathroom managed to fit a drawer about a centimeter behind the door, and eventually what ...
25
votes
1answer
1k views

What is the solution to Lewis Carroll's “Froggy's Problem”, and what is the “trap”?

Froggy's Problem was presented in Lewis Carroll's Symbolic Logic, with a note that it "contains a marvellous trap". Because Carroll never released Part 2 of Symbolic Logic, its solution is unknown. ...
3
votes
1answer
301 views

Floored and foiled

Scene 1 – A hallway There I was, in a corporate hallway 110 shaftments long (approximately 18 m or 60 ft) and unspooling a 100 -shaftment length of cable from a reel. All too ...
3
votes
1answer
266 views

Locate the position of moon on a newmoon day?

As an amateur astronomer, I wished to locate the position of the moon on the night of a newmoon day, where I was staying. I was on an island (on which I happended to land the same day morning), ...
9
votes
1answer
671 views

The tomb with the answer to life

Diophantus was a famous ancient Greek mathematician. This was carved on his tomb: Herein lies the remains of Diophantus. God vouchsafed that he should be a boy for the sixth part of his life; when ...
5
votes
0answers
607 views

Need help with a cipher

I am trying to figure out a cipher I think I found in a book from 1982 and it's a 36 year old mystery we are trying to solve (I will reveal the book if this turns out to be something so everyone can ...
20
votes
2answers
2k views

Who is Panama Oxridge?

Panama Oxridge is the author of a children's book series about a boy called Justin Thyme. However, the name Panama Oxridge is actually a pseudonym for an unknown author. From the series website: ...
-4
votes
1answer
269 views

Which screws go first?

Humans are not always accurate at measurements. I recently got a table top that came with an attachment. Table top and attachment are nearly of same size and rectangular with four screw holes near ...
6
votes
1answer
429 views

Picture a graph without words

You may have played/sung/heard a song without words in concert, in choir, and in a Sushi restaurant. Who hasn’t?! Well here is a picture without words, only axes: And here it is without JPG-...
26
votes
14answers
2k views

The master programmer and the mystical reversal

The master programmer sat at his desk, gazing into the distance, his eyes seeing, and yet unseeing. The lunch had been heavy. His reverie was interrupted by the appearance of his close colleague, ...
9
votes
3answers
507 views

Ridge Trail moisture mystery

(click to visit this picture via Google Street View) The weather was less pleasant than pictured above but the afternoon began nicely enough that I wasn’t about to waste an hour already ...
0
votes
10answers
1k views

Leave a room without entering it first

This is a quick little puzzle that requires a bit of lateral thinking. Today, my boss physically walked out of her office (her private room in the larger office), but she never physically entered her ...
15
votes
10answers
2k views

Two many rainbows?

Wish I’d had a camera at the time but a cartoon will have to suffice, representing two actual incomplete rainbows that stop in midair where they meet, lit only by a setting sun. This seemed so ...
11
votes
1answer
341 views

Binary coded message on a house in Catalonia

I found this inscription on a wall of a house in town of Martorell, Catalonia, Spain. It looks rather modern and I think its creator ciphered some word / message / joke in it. I tried to lookup ASCII ...
5
votes
8answers
759 views

A strange sight in London

While travelling in London, I noticed something strange. I saw some numbers which appeared to be counting up but which then switched to counting down. Later on, I saw the same thing, but the numbers ...
20
votes
1answer
2k views

Ricky McCormick's Notes

On June 30 1999, Ricky McCormick was found dead in an isolated area, 15 miles away from his home. He didn't own a car, and the area was not subjected to public transport so it is a mystery how he got ...
2
votes
2answers
372 views

Steganography TriBond™

These three have a technological attribute — me — in common:    •   What does each of these represent? •   How ...
9
votes
4answers
461 views

Mystery on the trail to Dutch Flat

On a recent amble, I happened upon a sign $\small \raise2mu ( {\normalsize\sf\color{#d90} A} \raise2mu )$ that seemed to indicate a mistake — or— a mystery. ...
26
votes
4answers
2k views

This image contains a “Great Discovery”

The Puzzle: Source material taken from here As discussed on Numberphile, here is John Herschel's doodle, sent to his friend Charles Babbage. John H. John Herschel was an English polymath, ...
28
votes
2answers
5k views

Does this metal puzzle have a solution (Baguenaudier)

When I was young I got this puzzle as a gift to me. The aim is to get the long piece out. I haven't yet found a solution, and I'm not sure if there is one Does this have a solution and if so ...
12
votes
21answers
860 views

The Empty Elevator [closed]

This is a lateral thinking puzzle based on my real life: Earlier this evening I got into an empty elevator, pressed a button for a floor, and walked out before the door closed. I wasn't being ...
9
votes
2answers
380 views

Third timer's a charm

Three motorized 24-hour light timers are arranged between a power outlet and a light bulb, with timer A parallel to a daisy chain of timers B and  C. For these timers, devise schedules that ...
3
votes
2answers
2k views

How to solve an Enigma Puzzle without indication?

A friend of mine just wrote one thing on a board : TEJDAO QZ OCUQJ UVANBVCR The only indication was "Enigma Puzzle". If it is really an Enigma like code how ...
8
votes
1answer
1k views

Sufi Number Square

Years ago I was gifted a copper number square by a Sufi mystic. I have puzzled over its significance for all these years and still haven't been able to find a suitable answer. The number square is a ...
2
votes
5answers
942 views

Please explain the solution to this? [closed]

1 set contains: 3, 2, 1 2nd set: 6, 6, 7 3rd set: 10, 9, ? What is ? Choose from: 7, 8, 11, 12, 13
7
votes
1answer
455 views

Reproduce output in picture using a logical input list by introducing a bug

I came across this picture and thought that this would be a fun programming puzzle to work out. (https://www.reddit.com/r/funny/comments/4hjf4y/ill_take_february_tickets_please) (Clearly, the ...
36
votes
1answer
773 views

Computations of an old woman

Recently I met a Polish woman who showed me something very interesting. Apparently her mother kept notebooks which she filled with strange calculations, never telling anyone what they were for. From ...
53
votes
1answer
5k views

Unsolved Mysteries: D'Agapeyeff cipher

The D'Agapeyeff cipher is an as-yet unbroken cipher that appears in the first edition of "Codes and Ciphers", an elementary book on cryptography published by the cryptographer Alexander D'Agapeyeff in ...
64
votes
1answer
15k views

Unsolved Mysteries: Kryptos

This is the second in a series of Unsolved Mysteries posts. These posts explore current unsolved real-world puzzles. Since these have been unsolved for years, it's uncertain whether anyone on on ...
12
votes
3answers
941 views

Day and night of the two timers

            Make a non - 24 - hour day /  night cycle       &...
8
votes
3answers
764 views

Odd hours with two timers

Two motorized 24-hour light timers are daisy chained between a power outlet and a light bulb. For these timers, devise schedules and choose initial times that produce the following repeated 9-hour ...
8
votes
3answers
571 views

Halve time with two timers

Two motorized 24-hour light timers are daisy chained between a power outlet and a light bulb. For these timers, devise schedules and choose initial times that produce the following repeated lighting ...
29
votes
0answers
10k views

The Beale Papers

The background to this one's given here. NB: These may not be a genuine cryptograms (current thinking is that these are gibberish); but I though it interesting to share these in case they're genuine /...
10
votes
2answers
865 views

Euclid's orchard

Once upon a time Isaac was lounging under a tree in Euclid's apple orchard, when something struck his foresight. “In the future,” he imagined, “the layout of these trees could help ...
19
votes
11answers
4k views

What's wrong with this line in a baking recipe book?

A cookie-baking recipe book (this one, specifically) has the following instruction in it, which is incorrect in a single spot: If you have a fan-assisted oven, you will need to reduce the recipe ...
28
votes
3answers
3k views

Unsolved Mysteries: Magic Square of Squares

This is the first in what will hopefully be a series of Unsolved Mysteries posts. Note that this puzzle has no known solution, nor any proof that a solution is impossible. We will see how ...
76
votes
2answers
3k views

A good puzzle is a double-edged sword

A rare double-edged sword is currently on loan from the British Museum to the Magna Carta exhibition. The sword itself is described as likely made in Germany around 1250-1330 and includes the ...
9
votes
1answer
45k views

3D wooden puzzle

I got a 3D wooden puzzle in which you are supposed to rebuild. I took pictures of the 6 pieces (click images to enlarge): I found this image on the Internet. I believe it's the solved version: How ...

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