# Category Articles

The supplier of the hardware store has brought us three boxes, one of which contains screws, another one contains nuts and the last one is full of nails. The person who has placed the labels with the contents of each box had a bad day, has been confused to put them and has not been successful with any label.

During my visit to St. Petersburg I met Tschigorinsky, the Russian chess expert, who told me that at the beginning of the Russian-Japanese hostilities, he was appointed commander of an army division where there were 20 regiments in continuous formation process, since he 100 men added weekly to each regiment.
The image shows three houses that must be connected to the electricity and gas services. To do this you have to draw a line from each house to each of the services without any of the lines crossing. Can you think of any way to do it? Solution The game is impossible to solve on flat paper.
The truth is that I love leather gloves. So much so that I have a drawer full of them on the nightstand. I have 15 pairs in total of which the majority are black and only 2 pairs are red. Sometimes in the morning when I get up, still with the light off I take several of the drawer in the hope that they are the same color and I can put them on although I don't always get it.
How could you easily prick a balloon with a knife without air escaping and without the balloon making noise? Solution With the balloon deflated.
There is one in a minute, two in a moment, but only one in a million years. What are we talking about? Solution Letter M.
In this picture we clearly see the face of a young man. Where does the old sailor hide? Solution To find it, simply flip the image:
Could you find three figures equal to that added up to 60, but without using the number 20? Solution No one said it had to be the sum of three numbers. In this case we can achieve our goal by adding two numbers with three equal figures: 55 + 5 = 60.
Three friends have the following conversation during Ana's birthday: Beatriz: My birthday is within 15 days. Carla: What a coincidence Beatriz, I turn them 15 days after you. Ana: Do you realize that all three birthdays fall on an odd day? What days are the girls birthday? Solution The only date on which it is met that by adding 15 days to an odd date we have another odd number and if we add another 15 days we have another odd date is January 31 of a leap year so that the dates of the The three friends' birthdays would be: Ana: January 31 Beatriz: February 15 Carla: March 1
I have an aunt who has a sister who is not my aunt. Who is my aunt's sister? Solution My aunt's sister is my mother.
How many different possible moves do we have to start a game of chess? Solution There are 20 possible ways to start a chess game: 16 different ways to move the eight pawns and 4 ways to move the two horses.
A different vision, conception and interpretation of objects found in nature. Solution Benoît Mandelbrot was the main creator of Fractal Geometry. Fractal geometry is distinguished by a more abstract approach to the dimension that characterizes conventional geometry.
This is a practical problem to illustrate the difficulties of railway workers in the period in which trains were in their early childhood, before the introduction of double tracks, automatic detours or roundabouts of wagons. Yes, friends, we will travel back in time to the time of our brave grandparents, familiar with the recent arrival of the iron horse, to whom I dedicate this riddle, along with the good woman who illustrated me with this problem based on her own experience.
The lively man.
In the following image you can see a key, but ... would you know to find in which hole it fits? Solution It is the fourth counting from the right.
How many triangles can you find in this pentagon? Solution Since the figure is drawn on a regular pentagon and if we turn it the fifth part of a turn it becomes itself, each triangle we find will be repeated five times, so that we can save some of the work.
What do you see in this image at first sight? Solution Recent research has shown that children cannot identify the intimate partner because they do not have the mind associated with that scenario. What they see are the nine dolphins. However, the rest of the minds are already experienced enough so that what is really difficult to see at first sight is the dolphins.
How many different colors do you see in the drawing? Solution The image has only three colors. What appears to be green or blue is the same color. The alteration in perception occurs because the eye combines adjacent colors. In this way, the smaller the image is or the further we move away from it, the more evident the effect is.
What is this picture you see, a picture of a rock with many holes, or with many stones? Solution It is actually an optical illusion of the Little Wild Horse Canyon in Goblin Valley (Utah). Both photos are from the same place, only one is turned upside down.
In this photo we can see the head of a swan, but do you notice anything strange? Solution It is actually a painted hand.
What do you see in the image on the left? Solution Some people see a woman's face first and others a trumpeter. If you look closely you will be able to see both.