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In the presence of side effects, a program's behavior depends on history; that is, the Side effects are the most common way to enable a program to interact with the outside. — “Side effect (computer science) - Wikipedia, the free encyclopedia”, en.wikipedia.org
One of the trickiest optical illusions in history. This image was originally created by Edward H. Adelson, but was uploaded on Wikipedia by Adrian Pingstone. This featured picture is a phenomenon regarding optical illusions. If you take a close look at squares A and B, both are of the same color. — “User:The Obento Musubi/Featured picture/2008/04 - Wikipedia”, en.wikipedia.org
By pooling our talents, even the trickiest of subjects should be understandable by anyone. Perhaps they feel they are the custodians of understanding? The challenge for Wikipedia should be to blend together material suitable for the casual reader and that which is rigorous and academic. — “User:StuFifeScotland - Wikipedia, the free encyclopedia”, en.wikipedia.org