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Einstein’s Riddle

Einstein’s Riddle


What’s Einstein’s theory on black holes?

Einstein’s riddle is a famous logic puzzle that has challenged people’s minds for decades. This puzzle, also known as the Zebra Puzzle, was rumored to have been created by Albert Einstein, although there is no evidence to support this claim. Regardless of its origins, the puzzle has become an iconic example of a brain teaser, and it continues to fascinate and frustrate people today.

The puzzle itself is deceptively simple. There are five houses in a row, each painted a different color, and each inhabited by a person of a different nationality. The five homeowners also each drink a different kind of beverage, smoke a different brand of cigar, and keep a different pet, one of which is a zebra. The puzzle requires the solver to use logic and deduction to determine the unique combination of attributes that describes each homeowner.

Did Feynman ever meet Einstein?

At first glance, the puzzle may seem like an unsolvable mystery, but with careful analysis and attention to detail, the solution can be found. Thus, the key to solving the puzzle lies in the clues that are provided. Each clue provides a small piece of information that, when combined with other clues, leads to a specific conclusion. Additionally, the solver must use their critical thinking skills to analyze each clue and determine what it means in relation to the other clues.

Furthermore, the clues themselves are quite specific and require careful reading and interpretation.

For example, the clue “The Brit lives in the red house” provides important information about both the nationality of the homeowner and the color of their house. Other clues, such as “The person who smokes Pall Mall cigars keeps birds” and “The person who smokes Blue Master cigars drinks beer,” provide information about the homeowner’s smoking habits and beverage preferences. Furthermore, by combining these clues, the solver can start to narrow down the possible combinations of attributes that describe each homeowner.

As the solver begins to piece together the puzzle, they must also keep track of the information that they have already determined. As a result, this is where careful note-taking and organization come into play. By creating a chart or diagram to keep track of each homeowner’s attributes, the solver can easily see which attributes are still unknown and which have been determined.

Ultimately, the solution to the puzzle requires a combination of deduction, critical thinking, and careful analysis of the clues provided. The final answer, which reveals the nationality of the homeowner who owns the zebra and the color of their house, is both satisfying and rewarding.

In conclusion, Einstein’s riddle is a challenging and intriguing puzzle that has fascinated people for decades. Moreover, its ability to test and sharpen critical thinking skills makes it an excellent exercise for anyone looking to improve their problem-solving abilities. Whether you are an avid puzzle solver or a beginner looking for a fun and engaging challenge, Einstein’s riddle is sure to provide hours of entertainment and mental stimulation.

The riddle goes like this:

There are five houses in a row, each painted a different color. In each house lives a person of a different nationality. The five homeowners each drink a different kind of beverage. And smoke a different brand of cigar, and keep a different pet, one of which is a zebra.

Here are some additional clues:

  1. The Brit lives in the red house.
  2. The Swede keeps dogs as pets.
  3. The Dane drinks tea.
  4. The green house is on the left of the white house. I.e., the green house is the first one, and the white house is the last one.
  5. The owner of the green house drinks coffee.
  6. The person who smokes Pall Mall cigars keeps birds.
  7. The owner of the yellow house smokes Dunhill cigars.
  8. The person who lives in the center house drinks milk.
  9. The Norwegian lives in the first house.
  10. The person who smokes Blends lives next to the one who keeps cats.
  11. The person who keeps horses lives next to the person who smokes Dunhill cigars.
  12. The person who smokes Blue Master cigars drinks beer.
  13. The German smokes Prince cigars.
  14. The Norwegian lives next to the blue house.
  15. The person who smokes Blends has a neighbor who drinks water.

Lastly, the question is: Who owns the zebra, and where do they live?

The answer is that the Norwegian owns the zebra, and he lives in the first house.

What’s Einstein’s Riddle?

 “Hybrid Algorithms for the Constraint Satisfaction Problem”doi:10.1111/j.1467-8640.1993.tb00310.xS2CID 36951414

  1.  “Is Einstein’s Puzzle Over-Specified?”
  2. “Who Owns The Fish? Solution”. Furthermore, archived from the original on 2010-06-30.
  3. Karttunen, Lauri“Einstein’s Puzzle”
  4.  Einstein’s Riddle: Riddles, Paradoxes, and Conundrums to Stretch Your Mind10–11 ISBN 978-1-59691-665-4.
  5. “How to Solve the Zebra Problem” 
  6.  “Capturing Constraint Programming Experience: A Case-Based Approach

What’s Einstein’s theory on black holes?


According to Einstein’s theory of general relativity, massive objects like black holes distort space and time. Which both magnifies the light and forces it to travel on a different path than it would otherwise. As a result, this becomes known as gravitational lensing.

Albert Einstein was one of the most influential physicists of the 20th century, and he made significant contributions to our understanding of the universe, including the concept of black holes. While Einstein did not use the term “black hole” himself, he predicted their existence through his work on general relativity.

In 1915, Einstein developed the theory of general relativity.

Which proposed that gravity is not a force between objects, but rather a curvature of spacetime caused by the presence of mass and energy. This theory predicted the existence of black holes, which are objects with such a strong gravitational field that nothing, not even light, can escape from them.

Initially, Einstein was skeptical of the idea of black holes, and he doubted that they could exist in reality. In fact, he worked to try and disprove the existence of black holes, arguing that they violated the laws of physics. However, over time, as more evidence became gathered, Einstein became more accepting of the idea of black holes.

Einstein’s theory of general relativity also predicted other phenomena associated with black holes, such as gravitational waves and the bending of light around massive objects. These predictions have since become confirmed through observations and experiments.

Overall, while Einstein initially doubted the existence of black holes, his work on general relativity laid the foundation for our understanding of these enigmatic objects. Today, black holes are a subject of intense study and fascination for physicists and astronomers, as they offer a window into the mysteries of the universe and the nature of gravity.

What’s Einstein’s theory on black holes?

Did Feynman ever meet Einstein?


Portrait of Einstein taken at Princeton

Richard Feynman did meet Albert Einstein. Feynman was a young graduate student at Princeton University in the early 1940s when he first met Einstein, who was a professor at the Institute for Advanced Study in Princeton. Feynman later described the meeting in his book “Surely You’re Joking, Mr. Feynman!”

Apparently Feynman’s first actual meeting with Einstein became quite disarming rather quickly when Einstein entered the seminar hall where Feynman was lecturing. Upon entrance into the hall Einstein said:

“Hello, I’m coming to your seminar. But first where’s the tea?”

Feynman (center) with Robert Oppenheimer (immediately right of Feynman) at Los Alamos Laboratory

Apparently Feynman felt so in awed of Einstein that he was shaking, his hand specifically while giving the lecture. Of course many of us have had a limb shake out of nervousness. Moreover, having Einstein in attendance and monitoring your lecture surely evokes stress to the Nth degree!

Feynman said of the lecture:

“the moment I start to think about Physics, and have to concentrate on what I’m explaining, nothing else occupies my mind. I’m completely immune to being nervous.”

Feynman diagram of electron/positron annihilation

When the famous Wolfgang Pauli showed skepticism regarding Feynman’s lecture, Einstein said:

“The only difficulty that I would find is in the corresponding theory for gravitational interaction. Since we do not have a great deal of experimental evidence, I’m absolutely not sure of the correct gravitational theory.”

However, Feynman ended up becoming grateful of Pauli’s skepticism. As it turns out, Pauli’s question inspired Feynman to improve his work.

In conclusion Feynman said of Einstein:

“Einstein was a giant. His head was in the clouds, but his feet were on the ground. But those of us who are not that tall have to choose!”

Einstein’s Riddle

Did Feynman ever meet Einstein?

When Richard Feynman Met Albert Einstein | by Sunny Labh | Cantor’s Paradise (

Collective Electrodynamics: Quantum Foundations of Electromagnetism: Mead, Carver A.: 9780262632607: Books

Einstein’s Riddle