The trick here is that your eyes get used to the pattern right away. Once the brain sees row after row of the same figure, it stops searching for anything unusual. That is why the odd number blends in ...

The trick lies in repetition. Once the brain sees the same number appear dozens of times, it stops paying close attention. Psychologists often call this “visual fatigue.” Your eyes are scanning, but ...

A long-standing puzzle seems to constrain how addition and multiplication relate to each other. A graduate student has gone further than anyone else in establishing the connection. In 1983 the ...