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Put the numbers

Write in each of the 9 boxes of a board of size 3 x 3 one of the figures 1, 2 or 3, so that the sum of the figures written in each row, column and in any diagonal of the square is equal to 6. No number can be repeated in each row, column or diagonal. Solution There are several different solutions.
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Video about Post-traumatic Stress Disorder

PTSD Video Many people who survive extremely traumatic events develop PTSD. Survivors of wars and attacks are the most frequent victims, but there are also many other painful events that cause this disorder, such as rape, kidnapping, aviation accidents, disasters of natural phenomena, etc.
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Movement illusion

The images shown below are two static drawings without any movement. However, if we look at them, it seems that they move. Specifically, it gives the impression that the areas that are not our center of attention are moving but are in our peripheral vision. As soon as we focus our eyes on the area that we believe has movement, it stops moving.
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Ausubel's Theory of Significant Learning

David Paul Ausubel was an American psychologist whose most significant contribution he made in the fields of educational psychology, cognitive psychology, learning and development, investigating how our learning is organized and the significant advances in it. Content 1 Fundamentals of Ausubel's theory 2 The Theory of Learning according to Ausubel 3 What is meaningful learning?
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101 phrases to boost self-esteem

Self-esteem is the assessment that each person has about oneself. It is about emotional opinion and that, usually, exceeds rationalization and logic in its causes. Here you will find a fantastic collection of self-esteem phrases. The self-esteem that we have will influence almost everything we do, such as in decision-making, actions, aspirations, tastes and many other things that form the behavior, happiness and life of a person.
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