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Do people still use ACT-R?
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Do people still use ACT-R?

A lot of computational cognitive scientists seem to be working on Neural nets (mostly vision scientists), Reinforcement learning (mostly decision making people) and Bayesian Inferences. I could har…

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The French Cup 1975

Illustrations by Vecteezy That final match of the 1975 French Cup did not resemble any other. The teams that played the game: Lafrimbolle and Bidache, unknown were until that moment. Grosmougin, the goalkeeper of Lafrimbolle, had a serve so powerful that when he scored he scored 2 goals for his team.
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The shooting tournament

As a veteran shooter who has participated in many competitions I was very attentive to the recent cable shooting tournament where the Americans demonstrated their superiority over the French although with a very tight result: 4889 to 4821. The tournament was held simultaneously on both sides of the ocean while the results were cabled from one place to another, which made the tournament interesting and exciting.
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The mysterious clock

A mathematician friend of ours had a clock with very strange numbers, so we asked him what it was, he said: "This clock has all the numbers with mathematical operations of three nine each." He told us that he also had another clock in that the hours were indicated with mathematical operations that used three three each.
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Money bag

We have 26 bills in a bag. If we randomly take 20 bills from the bag, we will have at least one 1 dollar bill, two 2 dollar bills and 5 5 dollar bills. How much money is in the bag? Solution We will represent the 1 dollar bills with the letter "A", the two dollar bills with the letter "B" and the 5 dollar bills with the letter "C".
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The broken traffic light

An operator of the city traffic light maintenance service receives a call from a citizen to communicate that one of the traffic lights that regulates the passage of cars on the main avenue has a fused light. The operator who answers the call, asks his interlocutor what the light is cast but unfortunately the person who reports the problem is colorblind and is not able to determine the color of the light that does not work.
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Lion's best friend

Look closely at the following image of a lion. Can you find your prey? Solution To find the lion's dinner it is necessary to turn the image around:
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The glass of water

You have a glass that is half full of water approximately. How would you do it to get the air out of the other half? Solution Filling the rest of the glass with water too.
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The poem of the hare

A hunter goes hunting, today he eats the hare and tomorrow he kills it. How is it possible? Solution It is the hare that eats today, not the hunter who eats it.
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The day of the week

If tomorrow were yesterday, today would be as close to Sunday as if it were tomorrow yesterday. What day is today? Solution If tomorrow were yesterday, then today would be the day after tomorrow (2 more days) and if yesterday was tomorrow, then today would be before yesterday (2 days less). The only way that in both cases was equally close to Sunday is that today is Sunday.
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The centaurs

Let's see how you are doing in Greek mythology and mathematics. How many limbs have 3 centaurs? Solution The centaurs have 6 limbs then 3 centaurs will have 6 * 3 = 18 limbs.
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Impossible building

Look at this building well, can you see its right side? Solution It seems that the crystals on his right side reflect the light so well that it seems to be a continuation of the sky.
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Half of 2 plus 2

Really, no tricks! How much is half of two plus two? Solution Half of two plus two is three. Due to the prevalence of operations, division (half) must be done before adding (plus two) so we have (2/2) + 2 = 3.
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The sewer cover

There are three good reasons why sewer covers are round. Can you think of which ones? Solution A round lid cannot be cast through the hole it covers, unlike a square lid that could fall. Round covers can be rolled to their location since they are generally quite heavy.
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Christmas tree

How many different squares can you count in the following drawing? Solution We can count up to 23 different squares: 1 large, 8 medium and 14 small. (The rectangles are not worth)
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The illusion of the tower of Pisa

Look closely at these two images of the tower of Pisa. Which of the two is more inclined? Solution Actually it is exactly the same photo shown twice next to each other without any touch up. You can check it from some drawing program interchanged towers on the side.
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Hidden image

These seemingly pointless stripes form a well known symbol. Which? Solution It is the letter E rotated 90 ° counterclockwise.
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Woman in the forest

Are you able to see the woman hiding in the forest? Solution In this beautiful image of a winter forest we can find the silhouette of the face of a woman who occupies the entire central part of the photograph. Two branches of the upper part delimit the eye contour and another more centered in the lower part would represent the mouth.
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Rooftop musician

Here you can see a musician playing on the roof at night in the city, but look closely at the drawing, is everything normal? Solution If you look closely you will see that as houses are further away they become people's faces.
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