In the early 1970s mathematician Donald Knuth spent a sabbatical with his wife in Norway. The time was meant to be spent relaxing. Yet one night he woke up his partner in a state of agitation. He ...
When two, three or four apples are placed in front of us, we are able to recognize the number of apples very quickly. However, we need significantly more time if there are five or more apples and we ...
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